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Problems Archives

The problems archives table shows problems 1 to 641. 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
5221
302Strong Achilles Numbers
609
303Multiples with small digits
2973
304Primonacci
1739
305Reflexive Position
509
306Paper-strip Game
908
307Chip Defects
1322
308An amazing Prime-generating Automaton
639
309Integer Ladders
635
310Nim Square
883
311Biclinic Integral Quadrilaterals
357
312Cyclic paths on SierpiƄski graphs
690
313Sliding game
1285
314The Mouse on the Moon
413
315Digital root clocks
2690
316Numbers in decimal expansions
517
317Firecracker
2089
3182011 nines
721
319Bounded Sequences
319
320Factorials divisible by a huge integer
683
321Swapping Counters
1403
322Binomial coefficients divisible by 10
362
323Bitwise-OR operations on random integers
3136
324Building a tower
538
325Stone Game II
468
326Modulo Summations
417
327Rooms of Doom
928
328Lowest-cost Search
318
329Prime Frog
1994
330Euler's Number
409
331Cross flips
300
332Spherical triangles
470
333Special partitions
970
334Spilling the beans
375
335Gathering the beans
408
336Maximix Arrangements
1670
337Totient Stairstep Sequences
407
338Cutting Rectangular Grid Paper
262
339Peredur fab Efrawg
431
340Crazy Function
882
341Golomb's self-describing sequence
744
342The totient of a square is a cube
658
343Fractional Sequences
1146
344Silver dollar game
241
345Matrix Sum
4391
346Strong Repunits
3323
347Largest integer divisible by two primes
3514
348Sum of a square and a cube
2383
349Langton's ant
1540
350Constraining the least greatest and the greatest least
383