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Problems Archives

The problems archives table shows problems 1 to 739. 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
6109
302Strong Achilles Numbers
695
303Multiples with small digits
3414
304Primonacci
2015
305Reflexive Position
563
306Paper-strip Game
1092
307Chip Defects
1545
308An amazing Prime-generating Automaton
709
309Integer Ladders
744
310Nim Square
1061
311Biclinic Integral Quadrilaterals
403
312Cyclic paths on SierpiƄski graphs
778
313Sliding game
1506
314The Mouse on the Moon
472
315Digital root clocks
3187
316Numbers in decimal expansions
609
317Firecracker
2473
3182011 nines
859
319Bounded Sequences
369
320Factorials divisible by a huge integer
791
321Swapping Counters
1616
322Binomial coefficients divisible by 10
427
323Bitwise-OR operations on random integers
3656
324Building a tower
654
325Stone Game II
553
326Modulo Summations
486
327Rooms of Doom
1065
328Lowest-cost Search
378
329Prime Frog
2342
330Euler's Number
477
331Cross flips
360
332Spherical triangles
546
333Special partitions
1138
334Spilling the beans
435
335Gathering the beans
467
336Maximix Arrangements
1920
337Totient Stairstep Sequences
473
338Cutting Rectangular Grid Paper
295
339Peredur fab Efrawg
511
340Crazy Function
1026
341Golomb's self-describing sequence
867
342The totient of a square is a cube
741
343Fractional Sequences
1316
344Silver dollar game
290
345Matrix Sum
5347
346Strong Repunits
4064
347Largest integer divisible by two primes
4312
348Sum of a square and a cube
2831
349Langton's ant
1789
350Constraining the least greatest and the greatest least
437