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Problems Archives

The problems archives table shows problems 1 to 617. 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
4873
302Strong Achilles Numbers
590
303Multiples with small digits
2874
304Primonacci
1695
305Reflexive Position
501
306Paper-strip Game
874
307Chip Defects
1272
308An amazing Prime-generating Automaton
616
309Integer Ladders
617
310Nim Square
834
311Biclinic Integral Quadrilaterals
355
312Cyclic paths on SierpiƄski graphs
659
313Sliding game
1220
314The Mouse on the Moon
402
315Digital root clocks
2536
316Numbers in decimal expansions
510
317Firecracker
1993
3182011 nines
701
319Bounded Sequences
316
320Factorials divisible by a huge integer
668
321Swapping Counters
1329
322Binomial coefficients divisible by 10
361
323Bitwise-OR operations on random integers
2958
324Building a tower
529
325Stone Game II
451
326Modulo Summations
407
327Rooms of Doom
900
328Lowest-cost Search
311
329Prime Frog
1912
330Euler's Number
401
331Cross flips
294
332Spherical triangles
462
333Special partitions
928
334Spilling the beans
369
335Gathering the beans
398
336Maximix Arrangements
1604
337Totient Stairstep Sequences
395
338Cutting Rectangular Grid Paper
259
339Peredur fab Efrawg
434
340Crazy Function
832
341Golomb's self-describing sequence
724
342The totient of a square is a cube
647
343Fractional Sequences
1096
344Silver dollar game
238
345Matrix Sum
4065
346Strong Repunits
3020
347Largest integer divisible by two primes
3232
348Sum of a square and a cube
2260
349Langton's ant
1478
350Constraining the least greatest and the greatest least
371