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Problems Archives

The problems archives table shows problems 1 to 699. 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
5797
302Strong Achilles Numbers
658
303Multiples with small digits
3223
304Primonacci
1899
305Reflexive Position
535
306Paper-strip Game
1008
307Chip Defects
1469
308An amazing Prime-generating Automaton
669
309Integer Ladders
697
310Nim Square
989
311Biclinic Integral Quadrilaterals
384
312Cyclic paths on SierpiƄski graphs
743
313Sliding game
1425
314The Mouse on the Moon
451
315Digital root clocks
3005
316Numbers in decimal expansions
573
317Firecracker
2312
3182011 nines
794
319Bounded Sequences
352
320Factorials divisible by a huge integer
742
321Swapping Counters
1543
322Binomial coefficients divisible by 10
399
323Bitwise-OR operations on random integers
3463
324Building a tower
605
325Stone Game II
520
326Modulo Summations
456
327Rooms of Doom
1024
328Lowest-cost Search
353
329Prime Frog
2209
330Euler's Number
453
331Cross flips
337
332Spherical triangles
521
333Special partitions
1083
334Spilling the beans
409
335Gathering the beans
437
336Maximix Arrangements
1822
337Totient Stairstep Sequences
453
338Cutting Rectangular Grid Paper
285
339Peredur fab Efrawg
478
340Crazy Function
968
341Golomb's self-describing sequence
823
342The totient of a square is a cube
708
343Fractional Sequences
1245
344Silver dollar game
270
345Matrix Sum
4991
346Strong Repunits
3818
347Largest integer divisible by two primes
4037
348Sum of a square and a cube
2654
349Langton's ant
1694
350Constraining the least greatest and the greatest least
420