Cache update: 27 minutes

Problems Archives

The problems archives table shows problems 1 to 667. 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
5501
302Strong Achilles Numbers
633
303Multiples with small digits
3071
304Primonacci
1808
305Reflexive Position
520
306Paper-strip Game
951
307Chip Defects
1395
308An amazing Prime-generating Automaton
662
309Integer Ladders
660
310Nim Square
927
311Biclinic Integral Quadrilaterals
368
312Cyclic paths on SierpiƄski graphs
711
313Sliding game
1346
314The Mouse on the Moon
434
315Digital root clocks
2828
316Numbers in decimal expansions
540
317Firecracker
2184
3182011 nines
748
319Bounded Sequences
327
320Factorials divisible by a huge integer
712
321Swapping Counters
1466
322Binomial coefficients divisible by 10
375
323Bitwise-OR operations on random integers
3276
324Building a tower
567
325Stone Game II
491
326Modulo Summations
430
327Rooms of Doom
961
328Lowest-cost Search
329
329Prime Frog
2088
330Euler's Number
423
331Cross flips
307
332Spherical triangles
489
333Special partitions
1018
334Spilling the beans
387
335Gathering the beans
416
336Maximix Arrangements
1733
337Totient Stairstep Sequences
426
338Cutting Rectangular Grid Paper
272
339Peredur fab Efrawg
456
340Crazy Function
914
341Golomb's self-describing sequence
779
342The totient of a square is a cube
675
343Fractional Sequences
1189
344Silver dollar game
252
345Matrix Sum
4666
346Strong Repunits
3565
347Largest integer divisible by two primes
3751
348Sum of a square and a cube
2512
349Langton's ant
1611
350Constraining the least greatest and the greatest least
396