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Problems Archives

The problems archives table shows problems 1 to 713. 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.


IDDescription / TitleSolved By
651Patterned Cylinders
142
652Distinct values of a proto-logarithmic function
143
653Frictionless Tube
255
654Neighbourly Constraints
271
655Divisible Palindromes
400
656Palindromic sequences
202
657Incomplete words
398
658Incomplete words II
198
659Largest prime
669
660Pandigital Triangles
240
661A Long Chess Match
189
662Fibonacci paths
560
663Sums of subarrays
274
664An infinite game
161
665Proportionate Nim
204
666Polymorphic Bacteria
219
667Moving Pentagon
177
668Square root smooth Numbers
789
669The King's Banquet
265
670Colouring a Strip
259
671Colouring a Loop
131
672One more one
224
673Beds and Desks
262
674Solving $\mathcal{I}$-equations
147
675$2^{\omega(n)}$
554
676Matching Digit Sums
195
677Coloured Graphs
142
678Fermat-like Equations
188
679Freefarea
593
680Yarra Gnisrever
154
681Maximal Area
187
6825-Smooth Pairs
217
683The Chase II
258
684Inverse Digit Sum
1315
685Inverse Digit Sum II
163
686Powers of Two
1698
687Shuffling Cards
213
688Piles of Plates
537
689Binary Series
182
690Tom and Jerry
147
691Long substring with many repetitions
215
692Siegbert and Jo
712
693Finite Sequence Generator
230
694Cube-full Divisors
587
695Random Rectangles
155
696Mahjong
79
697Randomly Decaying Sequence
390
698123 Numbers
311
699Triffle Numbers
124
700Eulercoin
1287