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Problems Archives

The problems archives table shows problems 1 to 621. 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
4935
302Strong Achilles Numbers
595
303Multiples with small digits
2886
304Primonacci
1693
305Reflexive Position
502
306Paper-strip Game
881
307Chip Defects
1273
308An amazing Prime-generating Automaton
622
309Integer Ladders
619
310Nim Square
841
311Biclinic Integral Quadrilaterals
353
312Cyclic paths on SierpiƄski graphs
660
313Sliding game
1231
314The Mouse on the Moon
396
315Digital root clocks
2557
316Numbers in decimal expansions
507
317Firecracker
2005
3182011 nines
698
319Bounded Sequences
315
320Factorials divisible by a huge integer
669
321Swapping Counters
1336
322Binomial coefficients divisible by 10
359
323Bitwise-OR operations on random integers
2996
324Building a tower
526
325Stone Game II
457
326Modulo Summations
406
327Rooms of Doom
902
328Lowest-cost Search
311
329Prime Frog
1922
330Euler's Number
401
331Cross flips
295
332Spherical triangles
460
333Special partitions
932
334Spilling the beans
368
335Gathering the beans
396
336Maximix Arrangements
1609
337Totient Stairstep Sequences
394
338Cutting Rectangular Grid Paper
259
339Peredur fab Efrawg
431
340Crazy Function
838
341Golomb's self-describing sequence
725
342The totient of a square is a cube
644
343Fractional Sequences
1101
344Silver dollar game
237
345Matrix Sum
4117
346Strong Repunits
3074
347Largest integer divisible by two primes
3273
348Sum of a square and a cube
2277
349Langton's ant
1481
350Constraining the least greatest and the greatest least
375