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Problems Archives

The problems archives table shows problems 1 to 751. 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
151
652Distinct values of a proto-logarithmic function
152
653Frictionless Tube
279
654Neighbourly Constraints
299
655Divisible Palindromes
450
656Palindromic sequences
218
657Incomplete words
458
658Incomplete words II
219
659Largest prime
777
660Pandigital Triangles
268
661A Long Chess Match
204
662Fibonacci paths
654
663Sums of subarrays
311
664An infinite game
170
665Proportionate Nim
222
666Polymorphic Bacteria
243
667Moving Pentagon
184
668Square root smooth Numbers
889
669The King's Banquet
283
670Colouring a Strip
290
671Colouring a Loop
145
672One more one
249
673Beds and Desks
290
674Solving $\mathcal{I}$-equations
157
675$2^{\omega(n)}$
621
676Matching Digit Sums
219
677Coloured Graphs
157
678Fermat-like Equations
203
679Freefarea
695
680Yarra Gnisrever
171
681Maximal Area
202
6825-Smooth Pairs
242
683The Chase II
281
684Inverse Digit Sum
1984
685Inverse Digit Sum II
181
686Powers of Two
2512
687Shuffling Cards
249
688Piles of Plates
620
689Binary Series
204
690Tom and Jerry
170
691Long substring with many repetitions
240
692Siegbert and Jo
1002
693Finite Sequence Generator
259
694Cube-full Divisors
769
695Random Rectangles
183
696Mahjong
140
697Randomly Decaying Sequence
461
698123 Numbers
362
699Triffle Numbers
161
700Eulercoin
2165