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Problems Archives

  • Problem 731 will be accessible in 7 hours, 13 minutes (Sunday, 25th October 2020, 10:00 am)

The problems archives table shows problems 1 to 720. 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
401Sum of squares of divisors
2306
402Integer-valued polynomials
351
403Lattice points enclosed by parabola and line
320
404Crisscross Ellipses
291
405A rectangular tiling
539
406Guessing Game
338
407Idempotents
2216
408Admissible paths through a grid
504
409Nim Extreme
412
410Circle and tangent line
250
411Uphill paths
568
412Gnomon numbering
445
413One-child Numbers
347
414Kaprekar constant
247
415Titanic sets
268
416A frog's trip
262
417Reciprocal cycles II
761
418Factorisation triples
619
419Look and say sequence
439
4202x2 positive integer matrix
394
421Prime factors of n15+1
577
422Sequence of points on a hyperbola
237
423Consecutive die throws
432
424Kakuro
354
425Prime connection
1310
426Box-ball system
227
427n-sequences
264
428Necklace of circles
214
429Sum of squares of unitary divisors
2324
430Range flips
772
431Square Space Silo
549
432Totient sum
427
433Steps in Euclid's algorithm
435
434Rigid graphs
304
435Polynomials of Fibonacci numbers
978
436Unfair wager
400
437Fibonacci primitive roots
698
438Integer part of polynomial equation's solutions
249
439Sum of sum of divisors
336
440GCD and Tiling
325
441The inverse summation of coprime couples
321
442Eleven-free integers
353
443GCD sequence
1021
444The Roundtable Lottery
270
445Retractions A
332
446Retractions B
313
447Retractions C
248
448Average least common multiple
294
449Chocolate covered candy
815
450Hypocycloid and Lattice points
177