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Problems Archives

The problems archives table shows problems 1 to 670. 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
5581
302Strong Achilles Numbers
640
303Multiples with small digits
3115
304Primonacci
1835
305Reflexive Position
526
306Paper-strip Game
963
307Chip Defects
1408
308An amazing Prime-generating Automaton
663
309Integer Ladders
664
310Nim Square
943
311Biclinic Integral Quadrilaterals
370
312Cyclic paths on SierpiƄski graphs
720
313Sliding game
1359
314The Mouse on the Moon
438
315Digital root clocks
2871
316Numbers in decimal expansions
543
317Firecracker
2212
3182011 nines
757
319Bounded Sequences
331
320Factorials divisible by a huge integer
718
321Swapping Counters
1490
322Binomial coefficients divisible by 10
379
323Bitwise-OR operations on random integers
3329
324Building a tower
574
325Stone Game II
491
326Modulo Summations
435
327Rooms of Doom
978
328Lowest-cost Search
331
329Prime Frog
2117
330Euler's Number
429
331Cross flips
315
332Spherical triangles
496
333Special partitions
1030
334Spilling the beans
391
335Gathering the beans
420
336Maximix Arrangements
1753
337Totient Stairstep Sequences
431
338Cutting Rectangular Grid Paper
275
339Peredur fab Efrawg
458
340Crazy Function
930
341Golomb's self-describing sequence
787
342The totient of a square is a cube
685
343Fractional Sequences
1201
344Silver dollar game
255
345Matrix Sum
4755
346Strong Repunits
3633
347Largest integer divisible by two primes
3833
348Sum of a square and a cube
2540
349Langton's ant
1630
350Constraining the least greatest and the greatest least
398