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Problems Archives

The problems archives table shows problems 1 to 746. 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
6144
302Strong Achilles Numbers
700
303Multiples with small digits
3438
304Primonacci
2031
305Reflexive Position
569
306Paper-strip Game
1102
307Chip Defects
1559
308An amazing Prime-generating Automaton
717
309Integer Ladders
751
310Nim Square
1069
311Biclinic Integral Quadrilaterals
402
312Cyclic paths on SierpiƄski graphs
783
313Sliding game
1517
314The Mouse on the Moon
476
315Digital root clocks
3217
316Numbers in decimal expansions
614
317Firecracker
2503
3182011 nines
873
319Bounded Sequences
372
320Factorials divisible by a huge integer
800
321Swapping Counters
1632
322Binomial coefficients divisible by 10
430
323Bitwise-OR operations on random integers
3683
324Building a tower
660
325Stone Game II
557
326Modulo Summations
488
327Rooms of Doom
1069
328Lowest-cost Search
388
329Prime Frog
2368
330Euler's Number
481
331Cross flips
364
332Spherical triangles
552
333Special partitions
1149
334Spilling the beans
442
335Gathering the beans
473
336Maximix Arrangements
1933
337Totient Stairstep Sequences
480
338Cutting Rectangular Grid Paper
302
339Peredur fab Efrawg
514
340Crazy Function
1039
341Golomb's self-describing sequence
874
342The totient of a square is a cube
745
343Fractional Sequences
1325
344Silver dollar game
290
345Matrix Sum
5404
346Strong Repunits
4101
347Largest integer divisible by two primes
4343
348Sum of a square and a cube
2866
349Langton's ant
1807
350Constraining the least greatest and the greatest least
441