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Dan's Problem Archives Index

Probs & answers . 1-10 . 11-20 . 21-30 . 31-40 . 41-50 . 51-60 . 61-70 . 71-80 . 81-90 . 91-100 . 101-110
Problems only . . . 1-10 . 11-20 . 21-30 . 31-40 . 41-50 . 51-60 . 61-70 . 71-80 . 81-90 . 91-100 . 101-110
Problems & answers . 111-120 . 121-130 . 131-140 . 141-150 . 151-160 . 161-170 . 171-180 . 181-190
Problems only . . . . . . . 111-120 . 121-130 . 131-140 . 141-150 . 151-160 . 161-170 . 171-180 . 181-190
Probs & ans . 191-200 . 201-210 . 211-220 . 221-230 . 231-240 . 241-250 . 251-260 . 261-270 . 271+
Problems only . 191-200 . 201-210 . 211-220 . 221-230 . 231-240 . 241-250 . 251-260 . 261-270 . 271+

or click on a title below to go to that problem in the
+ Complete Problem List +
Warning: These contain ANSWERS. For problems only, read
the title below and click on the 'Problems Only' number range above.
1- The Most Divisors 2 - Trains versus fly! 3 - Unit fractions 1/n 4 - The Census Taker 5 - Square root probs 6- Buying house nos. 7 - Name that pattern 8 - Clink wine glasses 9 - Strange Powers !! 10- Odd & Abundant? 11 -Impossible Twins? 12 -The ABC's of Cars 13 - Spider and the Fly 14:Intersecting Bubbles 15 -The Right Numbers 16 -The Magic Number 17 - How Many Ants ? 18-What Time Was It? 19 - World Cup Soccer 20:The Average Speed? 21:Men and/or Women 22 -How Much Space? 23-Fermat's First Thm 24:That's Sum Product 25 - To Seven-Eleven? 26-The Two Elephants 27 - How Many Tiles? 28 - Where On Earth? 29 - Fridays the 13 th 30 -Turk-o-nacci Nos. 31 - Paint My House! 32 - Squares in a Box 33 - Disk- o -Mania ! 34 Party like it's 1999 35 - Fifth Half Asleep 36- Under Salary Cap 37 - Bad Cancelling ! 38 - Same Birthday ? 39 - - Holy Triangle ! 40 -- More on Twins 41- Car AND Train! 42 - Co-Perfect Nos. 43 -"Divisorly" Nos. 44 - The Lying Truth 45 - Not Sold at 7-11 46: Round the Corner 47 - Roll That Prime! 48 - Cut The Cheese! 49 - Not So Peachy! 50 - Bouncing Ball... 51- The Age-Old Lie 52- - Determine - It ! 53 - Chickens'n'Eggs 54-The Three Boards 55 - The Millionaire! 56- Subtrac.Diamond 57 - Close to the Line 58 - - Y 2 Digits - - ? 59 - - Bicycle Shorts! 60 Odd Combinat'ns 61 - The Right Sticks 62 - Eat Lots of Fruit 63 - Sqrs into Primes 64 A Prime Complex 65 - - Goat or Sheep ? 66 - Holiday Cookies 67 - Into 2 Thousand! 68 -- Powerful Digits 69 -- The Do-It-Alls! 70 - "Can" Be Done! 71- Reciprocal Sums 72- Valentines 4 All! 73 - Divisible Dates? 74 - Four Centuries ! 75 - Work/Study Pts. 76 - The Triple Kiss! 77- Polynomial Road 78-RunForYourLife! 79- Open+Shut Case 80-Try Our Products 81 Change 4A Dollar 82 - - Solve Or Die ! 83:The Tree Amigos 84 Crazy Ma'ticians? 85 - - Total-ly Equal! 86- Number of Clues 87: 2 Balls and a Box 88- A Growing Road 89-Gear's The Thing 90 - Cross Numbers 91- A Sinking Storm 92 - Tiling Me Softly 93- One for the Ages 94 - Hole In The Ball 95 - Above Avg. Art 96 - Missing Dollar ? 97-Three Funny Nos. 98 - The Dinner Date 99 - Birds on the Run 100 - Parents To Bee? 101 -- The Fab Five ! 102 - Similar but Diff 103 - Weird Numbers 104 Dan's Prime Code 105- Ez Come, Ez Go 106- New Year Phone 107- Geometry Gems 108 - Cover The Cube 109- Based On What? 110 - Family Of Four 111 -- Wedding Cake 112 - Hands On Time 113 - The Two Cubes 114 - Price of Stamps 115 - Thinking Caps! 116 -- Hoop It Up ! ! 117 - Kissing Circles 118 -Cubes & Squares 119 Better than Perfect 120 -- Rotating Tires! 121 -- Gear Numbers 122 Power 2b Diffrnt 123 -- Tour de Ants ! 124 Lattice Midpoint 125- Goats for Sheep 126 -- Longest Train! 127- Hex Floor Tiles 128 - Two or 3 Kids? 129 Grand Exponents 130 - Triang-U-Later! 131 - Back at the 7-11 132 - - The Top Five ! 133 -- Walk, Eat, Bike 134 A Peachy Quintet 135 - Reciprocal Pairs 136 How Lo CanUGo 137 -- 2000 Shuffles ! 138 The Twelve Coins 139 - A Funny Inverse 140 Swimr Loses Cap 141 Where's the Road 142 - - Strike A Chord 143- Easy as A-B-C-D 144 - - - Click to 222 ! 145 - Up The Volume! 146 - Maxes & Means 147 - Circle the Roots! 148 - - Weird Bases !! 149 - Indep'd'ce Events 150 Hpy Bday Hermen 151 Friends, Wives, $ 152 Nearly Isosceles? 153- Sharon & Karen 154 - Swim 2D Boat ! 155 - Can You Digit ? 156 - This Old House 157- Chop,Skip,Chop 158- Digits in the Bag 159 Money in theHole 160 - Cubes Come 4th 161- Dimples All Over 162 Your Fav Subject? 163 - Riding The Train 164 - Three More Sqrs 165 -- Here's To 2003! 166 -- Happy And Sad 167 ExerciseEfficiently 168 Arranged by Hight 169 - Pay For Grades? 170 - Area's The Same 171 - Drowning Child! 172 - To Catch A Thief 173- Three Equal Areas 174 Pigs Pkeets Profits 175 Fruit Season Again 176 - Jack - and - Diane 177 - Cover That Table! 178 - - The Cat-Census 179 Around The World 180 Cover That Board? 181- A Triangular Duel 182 - Two More Trains 183 WhichKindaCandy 184 Crank Out Power(s) 185- Money-Go-Round 186- Sums of 2 Squares 187- Right Triang Spiral 188 - Chess Tournament 189- - -The Three Trees 190 -- The Flower Farm 191 -- The Disk Cutters 192 --- Slice Into Dice ! 193 - Even That's Odd ! 194 Uncomm'nMultiple 195 - Over-Committeed 196- The Pentominator! 197 CommonRemainder 198 - Odd and Different 199 - Twice The Angle ! 200- Run with the Dogs 201 CouplesBuyBooks 202- Magic Sqr Primes 203 Where's th' Crowd? 204 Where's th' Squares 205 ^Orange Pyramids^ 206 - Given GCD, LCM 207 The Lost Bill of Sale 208- The Third Degrees 209whenCosinesCollide 210- The Odd Olympics 211 Cogito Log-o-Sum 212 - C h e c k , P l e a s e 213 - Island Hopping... 214 -- The Four Means 215 - Put A Hex On It ! 216 - Band in Boston ? 217- Baskets of Apples 218 Holy Sphere +circle 219 -- See Double Free 220 - - Cube in a Cone! 221 Square, Not Square 222 SpareSumSquares? 223 Divisor Take-Away 224- Fractionacci Nums 225 3 Sums of 2 Nums 226 Conhexutive Nums 227 - - Photo Mosaics! 228 - Cross Numbers... 229 Partitions of Unity. 230- The Closest Dots ? 231 Obsessed wSquares 232 - oNly oNe loNe N 233 Lucas Square Sums 234 Saturated Numbers 235- From 0 To Infinity 236 - Gimme an Integer 237 - - Nearly Integers! 238 - - Cube It Together 239 -- The 3-4-5 Square 240 - - The Pies Have It 241- Local (loco)motion 242 Put a hex around you 243 AltitudeswithAttitude 244- Half More Number 245- Sphere of Influence 246 -- Beating the Cycle! 247-- I Am the Bugman! 248 HowManyRunners? 249- Eat a Peach (a mile) 250 - - Pack 'Em All In ! 251 - Nice / Dice / Twice 252 - - Nearly Multiples! 253 -- Powers Five Apart 254 Vote Four Pumpkins 255 - The Round Robins 256 - Get A Clue (or three) 257 -- nEver Say Never ? 258 -- The Math Contest 259- Ah, Now We Know 260 - White,Black,What? 261 - - Here's To Toast ! 262 -- Five Running Ten 263 - Cosine My Loan ? 264 Cubes&Sqrs 2gether 265 - Four Mini-Pollies! 266- Those Factorialoots 267- Squareful Numbers 268 Nine Tangled Wires 269 AnotherBrick inWall 270-SpheresFillingSpace 271 - Dan's Directriconix 272- StockProfits2dMax 273 - Best Best-Fit Curve

Browse the complete problem list, check out the weekly leader board,
or go back and work on this week's problem!

Deadline for Problem #273 is Sunday, Feb 17, 2008 !

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1- The Most Divisors 2 - Trains versus fly! 3 - Unit fractions 1/n 4 - The Census Taker 5 - Square root probs 6- Buying house nos. 7 - Name that pattern 8 - Clink wine glasses 9 - Strange Powers !! 10- Odd & Abundant?	11 -Impossible Twins? 12 -The ABC's of Cars 13 - Spider and the Fly 14:Intersecting Bubbles 15 -The Right Numbers 16 -The Magic Number 17 - How Many Ants ? 18-What Time Was It? 19 - World Cup Soccer 20:The Average Speed?	21:Men and/or Women 22 -How Much Space? 23-Fermat's First Thm 24:That's Sum Product 25 - To Seven-Eleven? 26-The Two Elephants 27 - How Many Tiles? 28 - Where On Earth? 29 - Fridays the 13 th 30 -Turk-o-nacci Nos.
31 - Paint My House! 32 - Squares in a Box 33 - Disk- o -Mania ! 34 Party like it's 1999 35 - Fifth Half Asleep 36- Under Salary Cap 37 - Bad Cancelling ! 38 - Same Birthday ? 39 - - Holy Triangle ! 40 -- More on Twins	41- Car AND Train! 42 - Co-Perfect Nos. 43 -"Divisorly" Nos. 44 - The Lying Truth 45 - Not Sold at 7-11 46: Round the Corner 47 - Roll That Prime! 48 - Cut The Cheese! 49 - Not So Peachy! 50 - Bouncing Ball...	51- The Age-Old Lie 52- - Determine - It ! 53 - Chickens'n'Eggs 54-The Three Boards 55 - The Millionaire! 56- Subtrac.Diamond 57 - Close to the Line 58 - - Y 2 Digits - - ? 59 - - Bicycle Shorts! 60 Odd Combinat'ns
61 - The Right Sticks 62 - Eat Lots of Fruit 63 - Sqrs into Primes 64 A Prime Complex 65 - - Goat or Sheep ? 66 - Holiday Cookies 67 - Into 2 Thousand! 68 -- Powerful Digits 69 -- The Do-It-Alls! 70 - "Can" Be Done!	71- Reciprocal Sums 72- Valentines 4 All! 73 - Divisible Dates? 74 - Four Centuries ! 75 - Work/Study Pts. 76 - The Triple Kiss! 77- Polynomial Road 78-RunForYourLife! 79- Open+Shut Case 80-Try Our Products	81 Change 4A Dollar 82 - - Solve Or Die ! 83:The Tree Amigos 84 Crazy Ma'ticians? 85 - - Total-ly Equal! 86- Number of Clues 87: 2 Balls and a Box 88- A Growing Road 89-Gear's The Thing 90 - Cross Numbers
91- A Sinking Storm 92 - Tiling Me Softly 93- One for the Ages 94 - Hole In The Ball 95 - Above Avg. Art 96 - Missing Dollar ? 97-Three Funny Nos. 98 - The Dinner Date 99 - Birds on the Run 100 - Parents To Bee?	101 -- The Fab Five ! 102 - Similar but Diff 103 - Weird Numbers 104 Dan's Prime Code 105- Ez Come, Ez Go 106- New Year Phone 107- Geometry Gems 108 - Cover The Cube 109- Based On What? 110 - Family Of Four	111 -- Wedding Cake 112 - Hands On Time 113 - The Two Cubes 114 - Price of Stamps 115 - Thinking Caps! 116 -- Hoop It Up ! ! 117 - Kissing Circles 118 -Cubes & Squares 119 Better than Perfect 120 -- Rotating Tires!
121 -- Gear Numbers 122 Power 2b Diffrnt 123 -- Tour de Ants ! 124 Lattice Midpoint 125- Goats for Sheep 126 -- Longest Train! 127- Hex Floor Tiles 128 - Two or 3 Kids? 129 Grand Exponents 130 - Triang-U-Later!	131 - Back at the 7-11 132 - - The Top Five ! 133 -- Walk, Eat, Bike 134 A Peachy Quintet 135 - Reciprocal Pairs 136 How Lo CanUGo 137 -- 2000 Shuffles ! 138 The Twelve Coins 139 - A Funny Inverse 140 Swimr Loses Cap	141 Where's the Road 142 - - Strike A Chord 143- Easy as A-B-C-D 144 - - - Click to 222 ! 145 - Up The Volume! 146 - Maxes & Means 147 - Circle the Roots! 148 - - Weird Bases !! 149 - Indep'd'ce Events 150 Hpy Bday Hermen
151 Friends, Wives, $ 152 Nearly Isosceles? 153- Sharon & Karen 154 - Swim 2D Boat ! 155 - Can You Digit ? 156 - This Old House 157- Chop,Skip,Chop 158- Digits in the Bag 159 Money in theHole 160 - Cubes Come 4th	161- Dimples All Over 162 Your Fav Subject? 163 - Riding The Train 164 - Three More Sqrs 165 -- Here's To 2003! 166 -- Happy And Sad 167 ExerciseEfficiently 168 Arranged by Hight 169 - Pay For Grades? 170 - Area's The Same	171 - Drowning Child! 172 - To Catch A Thief 173- Three Equal Areas 174 Pigs Pkeets Profits 175 Fruit Season Again 176 - Jack - and - Diane 177 - Cover That Table! 178 - - The Cat-Census 179 Around The World 180 Cover That Board?
181- A Triangular Duel 182 - Two More Trains 183 WhichKindaCandy 184 Crank Out Power(s) 185- Money-Go-Round 186- Sums of 2 Squares 187- Right Triang Spiral 188 - Chess Tournament 189- - -The Three Trees 190 -- The Flower Farm	191 -- The Disk Cutters 192 --- Slice Into Dice ! 193 - Even That's Odd ! 194 Uncomm'nMultiple 195 - Over-Committeed 196- The Pentominator! 197 CommonRemainder 198 - Odd and Different 199 - Twice The Angle ! 200- Run with the Dogs	201 CouplesBuyBooks 202- Magic Sqr Primes 203 Where's th' Crowd? 204 Where's th' Squares 205 ^Orange Pyramids^ 206 - Given GCD, LCM 207 The Lost Bill of Sale 208- The Third Degrees 209whenCosinesCollide 210- The Odd Olympics
211 Cogito Log-o-Sum 212 - C h e c k , P l e a s e 213 - Island Hopping... 214 -- The Four Means 215 - Put A Hex On It ! 216 - Band in Boston ? 217- Baskets of Apples 218 Holy Sphere +circle 219 -- See Double Free 220 - - Cube in a Cone!	221 Square, Not Square 222 SpareSumSquares? 223 Divisor Take-Away 224- Fractionacci Nums 225 3 Sums of 2 Nums 226 Conhexutive Nums 227 - - Photo Mosaics! 228 - Cross Numbers... 229 Partitions of Unity. 230- The Closest Dots ?	231 Obsessed wSquares 232 - oNly oNe loNe N 233 Lucas Square Sums 234 Saturated Numbers 235- From 0 To Infinity 236 - Gimme an Integer 237 - - Nearly Integers! 238 - - Cube It Together 239 -- The 3-4-5 Square 240 - - The Pies Have It
241- Local (loco)motion 242 Put a hex around you 243 AltitudeswithAttitude 244- Half More Number 245- Sphere of Influence 246 -- Beating the Cycle! 247-- I Am the Bugman! 248 HowManyRunners? 249- Eat a Peach (a mile) 250 - - Pack 'Em All In !	251 - Nice / Dice / Twice 252 - - Nearly Multiples! 253 -- Powers Five Apart 254 Vote Four Pumpkins 255 - The Round Robins 256 - Get A Clue (or three) 257 -- nEver Say Never ? 258 -- The Math Contest 259- Ah, Now We Know 260 - White,Black,What?	261 - - Here's To Toast ! 262 -- Five Running Ten 263 - Cosine My Loan ? 264 Cubes&Sqrs 2gether 265 - Four Mini-Pollies! 266- Those Factorialoots 267- Squareful Numbers 268 Nine Tangled Wires 269 AnotherBrick inWall 270-SpheresFillingSpace
271 - Dan's Directriconix 272- StockProfits2dMax 273 - Best Best-Fit Curve