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Problems Archives

  • Problem 727 will be accessible in 11 hours, 6 minutes (Saturday, 26th September 2020, 11:00 pm)

The problems archives table shows problems 1 to 716. 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
5991
302Strong Achilles Numbers
682
303Multiples with small digits
3359
304Primonacci
1960
305Reflexive Position
551
306Paper-strip Game
1047
307Chip Defects
1512
308An amazing Prime-generating Automaton
688
309Integer Ladders
719
310Nim Square
1016
311Biclinic Integral Quadrilaterals
397
312Cyclic paths on SierpiƄski graphs
763
313Sliding game
1471
314The Mouse on the Moon
465
315Digital root clocks
3117
316Numbers in decimal expansions
591
317Firecracker
2413
3182011 nines
830
319Bounded Sequences
363
320Factorials divisible by a huge integer
771
321Swapping Counters
1591
322Binomial coefficients divisible by 10
417
323Bitwise-OR operations on random integers
3587
324Building a tower
637
325Stone Game II
537
326Modulo Summations
475
327Rooms of Doom
1047
328Lowest-cost Search
369
329Prime Frog
2284
330Euler's Number
469
331Cross flips
351
332Spherical triangles
536
333Special partitions
1109
334Spilling the beans
427
335Gathering the beans
453
336Maximix Arrangements
1885
337Totient Stairstep Sequences
461
338Cutting Rectangular Grid Paper
292
339Peredur fab Efrawg
495
340Crazy Function
997
341Golomb's self-describing sequence
854
342The totient of a square is a cube
725
343Fractional Sequences
1284
344Silver dollar game
280
345Matrix Sum
5220
346Strong Repunits
3964
347Largest integer divisible by two primes
4201
348Sum of a square and a cube
2753
349Langton's ant
1751
350Constraining the least greatest and the greatest least
432