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Problems Archives

The problems archives table shows problems 1 to 745. 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
451Modular inverses
1311
452Long Products
525
453Lattice Quadrilaterals
200
454Diophantine reciprocals III
430
455Powers With Trailing Digits
652
456Triangles containing the origin II
377
457A polynomial modulo the square of a prime
708
458Permutations of Project
855
459Flipping game
213
460An ant on the move
301
461Almost Pi
1104
462Permutation of 3-smooth numbers
287
463A weird recurrence relation
998
464Möbius function and intervals
278
465Polar polygons
198
466Distinct terms in a multiplication table
291
467Superinteger
395
468Smooth divisors of binomial coefficients
244
469Empty chairs
684
470Super Ramvok
210
471Triangle inscribed in ellipse
196
472Comfortable Distance II
244
473Phigital number base
670
474Last digits of divisors
375
475Music festival
407
476Circle Packing II
389
477Number Sequence Game
236
478Mixtures
169
479Roots on the Rise
1188
480The Last Question
528
481Chef Showdown
212
482The incenter of a triangle
192
483Repeated permutation
195
484Arithmetic Derivative
289
485Maximum number of divisors
1055
486Palindrome-containing strings
229
487Sums of power sums
583
488Unbalanced Nim
218
489Common factors between two sequences
208
490Jumping frog
261
491Double pandigital number divisible by 11
2000
492Exploding sequence
314
493Under The Rainbow
4969
494Collatz prefix families
191
495Writing n as the product of k distinct positive integers
247
496Incenter and circumcenter of triangle
278
497Drunken Tower of Hanoi
460
498Remainder of polynomial division
464
499St. Petersburg Lottery
289
500Problem 500!!!
3723