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Problems Archives

The problems archives table shows problems 1 to 739. 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
147
652Distinct values of a proto-logarithmic function
149
653Frictionless Tube
271
654Neighbourly Constraints
291
655Divisible Palindromes
432
656Palindromic sequences
214
657Incomplete words
442
658Incomplete words II
214
659Largest prime
749
660Pandigital Triangles
257
661A Long Chess Match
198
662Fibonacci paths
624
663Sums of subarrays
294
664An infinite game
170
665Proportionate Nim
218
666Polymorphic Bacteria
238
667Moving Pentagon
183
668Square root smooth Numbers
864
669The King's Banquet
278
670Colouring a Strip
280
671Colouring a Loop
141
672One more one
234
673Beds and Desks
277
674Solving $\mathcal{I}$-equations
151
675$2^{\omega(n)}$
602
676Matching Digit Sums
210
677Coloured Graphs
152
678Fermat-like Equations
199
679Freefarea
659
680Yarra Gnisrever
162
681Maximal Area
198
6825-Smooth Pairs
234
683The Chase II
278
684Inverse Digit Sum
1760
685Inverse Digit Sum II
175
686Powers of Two
2237
687Shuffling Cards
243
688Piles of Plates
599
689Binary Series
191
690Tom and Jerry
162
691Long substring with many repetitions
234
692Siegbert and Jo
911
693Finite Sequence Generator
255
694Cube-full Divisors
721
695Random Rectangles
177
696Mahjong
128
697Randomly Decaying Sequence
431
698123 Numbers
348
699Triffle Numbers
150
700Eulercoin
1888