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Problems Archives

The problems archives table shows problems 1 to 751. 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
1331
452Long Products
535
453Lattice Quadrilaterals
203
454Diophantine reciprocals III
442
455Powers With Trailing Digits
666
456Triangles containing the origin II
378
457A polynomial modulo the square of a prime
720
458Permutations of Project
868
459Flipping game
218
460An ant on the move
304
461Almost Pi
1125
462Permutation of 3-smooth numbers
294
463A weird recurrence relation
1015
464Möbius function and intervals
282
465Polar polygons
201
466Distinct terms in a multiplication table
299
467Superinteger
403
468Smooth divisors of binomial coefficients
250
469Empty chairs
693
470Super Ramvok
213
471Triangle inscribed in ellipse
197
472Comfortable Distance II
250
473Phigital number base
685
474Last digits of divisors
383
475Music festival
412
476Circle Packing II
398
477Number Sequence Game
240
478Mixtures
172
479Roots on the Rise
1205
480The Last Question
533
481Chef Showdown
221
482The incenter of a triangle
193
483Repeated permutation
202
484Arithmetic Derivative
301
485Maximum number of divisors
1072
486Palindrome-containing strings
232
487Sums of power sums
596
488Unbalanced Nim
219
489Common factors between two sequences
212
490Jumping frog
268
491Double pandigital number divisible by 11
2020
492Exploding sequence
324
493Under The Rainbow
5049
494Collatz prefix families
195
495Writing n as the product of k distinct positive integers
255
496Incenter and circumcenter of triangle
284
497Drunken Tower of Hanoi
473
498Remainder of polynomial division
475
499St. Petersburg Lottery
295
500Problem 500!!!
3777