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Problems Archives

The problems archives table shows problems 1 to 682. 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
128
652Distinct values of a proto-logarithmic function
130
653Frictionless Tube
234
654Neighbourly Constraints
254
655Divisible Palindromes
355
656Palindromic sequences
188
657Incomplete words
343
658Incomplete words II
178
659Largest prime
571
660Pandigital Triangles
227
661A Long Chess Match
170
662Fibonacci paths
481
663Sums of subarrays
243
664An infinite game
148
665Proportionate Nim
189
666Polymorphic Bacteria
192
667Moving Pentagon
159
668Square root smooth Numbers
659
669The King's Banquet
241
670Colouring a Strip
233
671Colouring a Loop
111
672One more one
190
673Beds and Desks
213
674Solving $\mathcal{I}$-equations
128
675$2^{\omega(n)}$
447
676Matching Digit Sums
160
677Coloured Graphs
117
678Fermat-like Equations
164
679Freefarea
458
680Yarra Gnisrever
129
681Maximal Area
153
6825-Smooth Pairs
173