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Problems Archives

The problems archives table shows problems 1 to 713. 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
451Modular inverses
1240
452Long Products
497
453Lattice Quadrilaterals
189
454Diophantine reciprocals III
398
455Powers With Trailing Digits
623
456Triangles containing the origin II
365
457A polynomial modulo the square of a prime
670
458Permutations of Project
807
459Flipping game
201
460An ant on the move
289
461Almost Pi
1051
462Permutation of 3-smooth numbers
271
463A weird recurrence relation
954
464Möbius function and intervals
265
465Polar polygons
187
466Distinct terms in a multiplication table
270
467Superinteger
381
468Smooth divisors of binomial coefficients
234
469Empty chairs
653
470Super Ramvok
202
471Triangle inscribed in ellipse
185
472Comfortable Distance II
234
473Phigital number base
643
474Last digits of divisors
358
475Music festival
388
476Circle Packing II
368
477Number Sequence Game
225
478Mixtures
154
479Roots on the Rise
1110
480The Last Question
504
481Chef Showdown
200
482The incenter of a triangle
182
483Repeated permutation
179
484Arithmetic Derivative
261
485Maximum number of divisors
1004
486Palindrome-containing strings
212
487Sums of power sums
561
488Unbalanced Nim
204
489Common factors between two sequences
194
490Jumping frog
243
491Double pandigital number divisible by 11
1885
492Exploding sequence
302
493Under The Rainbow
4705
494Collatz prefix families
178
495Writing n as the product of k distinct positive integers
232
496Incenter and circumcenter of triangle
262
497Drunken Tower of Hanoi
430
498Remainder of polynomial division
441
499St. Petersburg Lottery
264
500Problem 500!!!
3515