Cache update: 46 minutes

Problems Archives

The problems archives table shows problems 1 to 652. 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
5317
302Strong Achilles Numbers
617
303Multiples with small digits
3000
304Primonacci
1767
305Reflexive Position
512
306Paper-strip Game
922
307Chip Defects
1342
308An amazing Prime-generating Automaton
647
309Integer Ladders
644
310Nim Square
890
311Biclinic Integral Quadrilaterals
360
312Cyclic paths on SierpiƄski graphs
693
313Sliding game
1310
314The Mouse on the Moon
416
315Digital root clocks
2740
316Numbers in decimal expansions
527
317Firecracker
2118
3182011 nines
726
319Bounded Sequences
318
320Factorials divisible by a huge integer
691
321Swapping Counters
1416
322Binomial coefficients divisible by 10
367
323Bitwise-OR operations on random integers
3182
324Building a tower
550
325Stone Game II
475
326Modulo Summations
423
327Rooms of Doom
935
328Lowest-cost Search
320
329Prime Frog
2029
330Euler's Number
408
331Cross flips
300
332Spherical triangles
478
333Special partitions
984
334Spilling the beans
378
335Gathering the beans
410
336Maximix Arrangements
1690
337Totient Stairstep Sequences
410
338Cutting Rectangular Grid Paper
263
339Peredur fab Efrawg
434
340Crazy Function
888
341Golomb's self-describing sequence
755
342The totient of a square is a cube
663
343Fractional Sequences
1158
344Silver dollar game
244
345Matrix Sum
4498
346Strong Repunits
3431
347Largest integer divisible by two primes
3601
348Sum of a square and a cube
2427
349Langton's ant
1568
350Constraining the least greatest and the greatest least
389