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Problems Archives

The problems archives table shows problems 1 to 726. 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
6041
302Strong Achilles Numbers
687
303Multiples with small digits
3381
304Primonacci
1990
305Reflexive Position
557
306Paper-strip Game
1064
307Chip Defects
1523
308An amazing Prime-generating Automaton
692
309Integer Ladders
729
310Nim Square
1031
311Biclinic Integral Quadrilaterals
397
312Cyclic paths on SierpiƄski graphs
771
313Sliding game
1482
314The Mouse on the Moon
467
315Digital root clocks
3149
316Numbers in decimal expansions
595
317Firecracker
2443
3182011 nines
837
319Bounded Sequences
363
320Factorials divisible by a huge integer
780
321Swapping Counters
1597
322Binomial coefficients divisible by 10
419
323Bitwise-OR operations on random integers
3617
324Building a tower
648
325Stone Game II
545
326Modulo Summations
480
327Rooms of Doom
1055
328Lowest-cost Search
373
329Prime Frog
2304
330Euler's Number
472
331Cross flips
355
332Spherical triangles
542
333Special partitions
1124
334Spilling the beans
430
335Gathering the beans
461
336Maximix Arrangements
1894
337Totient Stairstep Sequences
465
338Cutting Rectangular Grid Paper
293
339Peredur fab Efrawg
507
340Crazy Function
1011
341Golomb's self-describing sequence
861
342The totient of a square is a cube
731
343Fractional Sequences
1300
344Silver dollar game
285
345Matrix Sum
5273
346Strong Repunits
4002
347Largest integer divisible by two primes
4238
348Sum of a square and a cube
2788
349Langton's ant
1770
350Constraining the least greatest and the greatest least
435