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Problems Archives

The problems archives table shows problems 1 to 726. If you would like to tackle the 10 most recently published problems then go to Recent problems.
Click the description/title of the problem to view details and submit your answer.


ID

Description / TitleSolved By
651Patterned Cylinders
143
652Distinct values of a proto-logarithmic function
147
653Frictionless Tube
270
654Neighbourly Constraints
285
655Divisible Palindromes
417
656Palindromic sequences
213
657Incomplete words
437
658Incomplete words II
211
659Largest prime
722
660Pandigital Triangles
252
661A Long Chess Match
195
662Fibonacci paths
598
663Sums of subarrays
283
664An infinite game
168
665Proportionate Nim
214
666Polymorphic Bacteria
230
667Moving Pentagon
180
668Square root smooth Numbers
842
669The King's Banquet
275
670Colouring a Strip
272
671Colouring a Loop
141
672One more one
229
673Beds and Desks
272
674Solving $\mathcal{I}$-equations
150
675$2^{\omega(n)}$
582
676Matching Digit Sums
203
677Coloured Graphs
150
678Fermat-like Equations
195
679Freefarea
638
680Yarra Gnisrever
158
681Maximal Area
193
6825-Smooth Pairs
229
683The Chase II
273
684Inverse Digit Sum
1602
685Inverse Digit Sum II
172
686Powers of Two
2052
687Shuffling Cards
235
688Piles of Plates
573
689Binary Series
188
690Tom and Jerry
159
691Long substring with many repetitions
227
692Siegbert and Jo
844
693Finite Sequence Generator
243
694Cube-full Divisors
674
695Random Rectangles
168
696Mahjong
107
697Randomly Decaying Sequence
415
698123 Numbers
332
699Triffle Numbers
148
700Eulercoin
1680