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Problems Archives

The problems archives table shows problems 1 to 627. 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
5028
302Strong Achilles Numbers
595
303Multiples with small digits
2926
304Primonacci
1704
305Reflexive Position
504
306Paper-strip Game
885
307Chip Defects
1297
308An amazing Prime-generating Automaton
626
309Integer Ladders
627
310Nim Square
847
311Biclinic Integral Quadrilaterals
353
312Cyclic paths on SierpiƄski graphs
672
313Sliding game
1253
314The Mouse on the Moon
404
315Digital root clocks
2601
316Numbers in decimal expansions
509
317Firecracker
2031
3182011 nines
702
319Bounded Sequences
312
320Factorials divisible by a huge integer
673
321Swapping Counters
1361
322Binomial coefficients divisible by 10
359
323Bitwise-OR operations on random integers
3051
324Building a tower
532
325Stone Game II
458
326Modulo Summations
407
327Rooms of Doom
905
328Lowest-cost Search
310
329Prime Frog
1946
330Euler's Number
401
331Cross flips
295
332Spherical triangles
462
333Special partitions
946
334Spilling the beans
369
335Gathering the beans
398
336Maximix Arrangements
1630
337Totient Stairstep Sequences
399
338Cutting Rectangular Grid Paper
253
339Peredur fab Efrawg
427
340Crazy Function
855
341Golomb's self-describing sequence
727
342The totient of a square is a cube
646
343Fractional Sequences
1109
344Silver dollar game
234
345Matrix Sum
4219
346Strong Repunits
3158
347Largest integer divisible by two primes
3361
348Sum of a square and a cube
2318
349Langton's ant
1504
350Constraining the least greatest and the greatest least
374