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Problems Archives

The problems archives table shows problems 1 to 666. 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
121
652Distinct values of a proto-logarithmic function
124
653Frictionless Tube
217
654Neighbourly Constraints
231
655Divisible Palindromes
302
656Palindromic sequences
178
657Incomplete words
275
658Incomplete words II
159
659Largest prime
440
660Pandigital Triangles
200
661A Long Chess Match
154
662Fibonacci paths
370
663Sums of subarrays
197
664An infinite game
124
665Proportionate Nim
158
666Polymorphic Bacteria
157