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Problems Archives

The problems archives table shows problems 1 to 746. 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
150
652Distinct values of a proto-logarithmic function
150
653Frictionless Tube
272
654Neighbourly Constraints
295
655Divisible Palindromes
442
656Palindromic sequences
214
657Incomplete words
450
658Incomplete words II
215
659Largest prime
761
660Pandigital Triangles
262
661A Long Chess Match
201
662Fibonacci paths
641
663Sums of subarrays
300
664An infinite game
170
665Proportionate Nim
221
666Polymorphic Bacteria
239
667Moving Pentagon
183
668Square root smooth Numbers
877
669The King's Banquet
279
670Colouring a Strip
284
671Colouring a Loop
142
672One more one
244
673Beds and Desks
282
674Solving $\mathcal{I}$-equations
152
675$2^{\omega(n)}$
612
676Matching Digit Sums
211
677Coloured Graphs
154
678Fermat-like Equations
200
679Freefarea
671
680Yarra Gnisrever
164
681Maximal Area
200
6825-Smooth Pairs
237
683The Chase II
279
684Inverse Digit Sum
1857
685Inverse Digit Sum II
178
686Powers of Two
2364
687Shuffling Cards
245
688Piles of Plates
609
689Binary Series
198
690Tom and Jerry
162
691Long substring with many repetitions
239
692Siegbert and Jo
955
693Finite Sequence Generator
258
694Cube-full Divisors
747
695Random Rectangles
179
696Mahjong
133
697Randomly Decaying Sequence
438
698123 Numbers
353
699Triffle Numbers
155
700Eulercoin
2002