Cache update: 52 minutes

Problems Archives

  • Problem 699 will be accessible in 4 hours, 45 minutes (Sunday, 26th January 2020, 10:00 am)

The problems archives table shows problems 1 to 688. 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
5731
302Strong Achilles Numbers
651
303Multiples with small digits
3176
304Primonacci
1867
305Reflexive Position
533
306Paper-strip Game
989
307Chip Defects
1452
308An amazing Prime-generating Automaton
668
309Integer Ladders
684
310Nim Square
977
311Biclinic Integral Quadrilaterals
380
312Cyclic paths on SierpiƄski graphs
732
313Sliding game
1402
314The Mouse on the Moon
449
315Digital root clocks
2965
316Numbers in decimal expansions
566
317Firecracker
2279
3182011 nines
781
319Bounded Sequences
342
320Factorials divisible by a huge integer
731
321Swapping Counters
1521
322Binomial coefficients divisible by 10
390
323Bitwise-OR operations on random integers
3419
324Building a tower
594
325Stone Game II
513
326Modulo Summations
447
327Rooms of Doom
1007
328Lowest-cost Search
346
329Prime Frog
2177
330Euler's Number
445
331Cross flips
331
332Spherical triangles
513
333Special partitions
1070
334Spilling the beans
403
335Gathering the beans
431
336Maximix Arrangements
1796
337Totient Stairstep Sequences
446
338Cutting Rectangular Grid Paper
279
339Peredur fab Efrawg
471
340Crazy Function
952
341Golomb's self-describing sequence
807
342The totient of a square is a cube
697
343Fractional Sequences
1228
344Silver dollar game
260
345Matrix Sum
4904
346Strong Repunits
3756
347Largest integer divisible by two primes
3972
348Sum of a square and a cube
2607
349Langton's ant
1673
350Constraining the least greatest and the greatest least
408