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Problems Archives

The problems archives table shows problems 1 to 661. 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
5422
302Strong Achilles Numbers
627
303Multiples with small digits
3031
304Primonacci
1783
305Reflexive Position
519
306Paper-strip Game
934
307Chip Defects
1366
308An amazing Prime-generating Automaton
656
309Integer Ladders
648
310Nim Square
908
311Biclinic Integral Quadrilaterals
363
312Cyclic paths on SierpiƄski graphs
699
313Sliding game
1324
314The Mouse on the Moon
424
315Digital root clocks
2780
316Numbers in decimal expansions
534
317Firecracker
2150
3182011 nines
736
319Bounded Sequences
324
320Factorials divisible by a huge integer
700
321Swapping Counters
1440
322Binomial coefficients divisible by 10
372
323Bitwise-OR operations on random integers
3227
324Building a tower
554
325Stone Game II
484
326Modulo Summations
427
327Rooms of Doom
949
328Lowest-cost Search
324
329Prime Frog
2045
330Euler's Number
414
331Cross flips
302
332Spherical triangles
483
333Special partitions
1001
334Spilling the beans
379
335Gathering the beans
413
336Maximix Arrangements
1711
337Totient Stairstep Sequences
412
338Cutting Rectangular Grid Paper
265
339Peredur fab Efrawg
442
340Crazy Function
903
341Golomb's self-describing sequence
762
342The totient of a square is a cube
665
343Fractional Sequences
1173
344Silver dollar game
246
345Matrix Sum
4578
346Strong Repunits
3491
347Largest integer divisible by two primes
3654
348Sum of a square and a cube
2466
349Langton's ant
1587
350Constraining the least greatest and the greatest least
392