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Problems Archives

The problems archives table shows problems 1 to 679. 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
301Nim
5652
302Strong Achilles Numbers
644
303Multiples with small digits
3143
304Primonacci
1850
305Reflexive Position
529
306Paper-strip Game
972
307Chip Defects
1424
308An amazing Prime-generating Automaton
665
309Integer Ladders
672
310Nim Square
950
311Biclinic Integral Quadrilaterals
372
312Cyclic paths on SierpiƄski graphs
725
313Sliding game
1377
314The Mouse on the Moon
442
315Digital root clocks
2914
316Numbers in decimal expansions
554
317Firecracker
2236
3182011 nines
766
319Bounded Sequences
334
320Factorials divisible by a huge integer
723
321Swapping Counters
1505
322Binomial coefficients divisible by 10
383
323Bitwise-OR operations on random integers
3379
324Building a tower
582
325Stone Game II
502
326Modulo Summations
442
327Rooms of Doom
993
328Lowest-cost Search
336
329Prime Frog
2153
330Euler's Number
436
331Cross flips
324
332Spherical triangles
501
333Special partitions
1049
334Spilling the beans
398
335Gathering the beans
425
336Maximix Arrangements
1773
337Totient Stairstep Sequences
435
338Cutting Rectangular Grid Paper
278
339Peredur fab Efrawg
466
340Crazy Function
944
341Golomb's self-describing sequence
793
342The totient of a square is a cube
691
343Fractional Sequences
1213
344Silver dollar game
258
345Matrix Sum
4825
346Strong Repunits
3690
347Largest integer divisible by two primes
3894
348Sum of a square and a cube
2573
349Langton's ant
1652
350Constraining the least greatest and the greatest least
402