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Problems Archives

The problems archives table shows problems 1 to 632. 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
5113
302Strong Achilles Numbers
600
303Multiples with small digits
2938
304Primonacci
1718
305Reflexive Position
506
306Paper-strip Game
893
307Chip Defects
1310
308An amazing Prime-generating Automaton
631
309Integer Ladders
629
310Nim Square
865
311Biclinic Integral Quadrilaterals
353
312Cyclic paths on SierpiƄski graphs
683
313Sliding game
1265
314The Mouse on the Moon
410
315Digital root clocks
2647
316Numbers in decimal expansions
514
317Firecracker
2065
3182011 nines
710
319Bounded Sequences
315
320Factorials divisible by a huge integer
676
321Swapping Counters
1379
322Binomial coefficients divisible by 10
357
323Bitwise-OR operations on random integers
3090
324Building a tower
535
325Stone Game II
461
326Modulo Summations
409
327Rooms of Doom
907
328Lowest-cost Search
312
329Prime Frog
1971
330Euler's Number
405
331Cross flips
295
332Spherical triangles
463
333Special partitions
952
334Spilling the beans
371
335Gathering the beans
403
336Maximix Arrangements
1649
337Totient Stairstep Sequences
402
338Cutting Rectangular Grid Paper
260
339Peredur fab Efrawg
430
340Crazy Function
866
341Golomb's self-describing sequence
736
342The totient of a square is a cube
653
343Fractional Sequences
1130
344Silver dollar game
236
345Matrix Sum
4303
346Strong Repunits
3243
347Largest integer divisible by two primes
3429
348Sum of a square and a cube
2346
349Langton's ant
1517
350Constraining the least greatest and the greatest least
377