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Problems Archives

The problems archives table shows problems 1 to 751. 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.


ID

Description / TitleSolved By
301Nim
6216
302Strong Achilles Numbers
707
303Multiples with small digits
3471
304Primonacci
2055
305Reflexive Position
571
306Paper-strip Game
1115
307Chip Defects
1573
308An amazing Prime-generating Automaton
728
309Integer Ladders
761
310Nim Square
1082
311Biclinic Integral Quadrilaterals
409
312Cyclic paths on SierpiƄski graphs
801
313Sliding game
1532
314The Mouse on the Moon
484
315Digital root clocks
3235
316Numbers in decimal expansions
624
317Firecracker
2529
3182011 nines
885
319Bounded Sequences
378
320Factorials divisible by a huge integer
814
321Swapping Counters
1644
322Binomial coefficients divisible by 10
436
323Bitwise-OR operations on random integers
3713
324Building a tower
670
325Stone Game II
564
326Modulo Summations
494
327Rooms of Doom
1080
328Lowest-cost Search
395
329Prime Frog
2389
330Euler's Number
488
331Cross flips
371
332Spherical triangles
562
333Special partitions
1162
334Spilling the beans
449
335Gathering the beans
479
336Maximix Arrangements
1949
337Totient Stairstep Sequences
488
338Cutting Rectangular Grid Paper
311
339Peredur fab Efrawg
520
340Crazy Function
1053
341Golomb's self-describing sequence
882
342The totient of a square is a cube
756
343Fractional Sequences
1338
344Silver dollar game
294
345Matrix Sum
5466
346Strong Repunits
4146
347Largest integer divisible by two primes
4385
348Sum of a square and a cube
2889
349Langton's ant
1822
350Constraining the least greatest and the greatest least
443