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Problems Archives

The problems archives table shows problems 1 to 641. 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
1086
452Long Products
431
453Lattice Quadrilaterals
172
454Diophantine reciprocals III
353
455Powers With Trailing Digits
546
456Triangles containing the origin II
314
457A polynomial modulo the square of a prime
571
458Permutations of Project
678
459Flipping game
174
460An ant on the move
257
461Almost Pi
922
462Permutation of 3-smooth numbers
224
463A weird recurrence relation
827
464Möbius function and intervals
218
465Polar polygons
159
466Distinct terms in a multiplication table
226
467Superinteger
328
468Smooth divisors of binomial coefficients
191
469Empty chairs
568
470Super Ramvok
170
471Triangle inscribed in ellipse
160
472Comfortable Distance II
202
473Phigital number base
568
474Last digits of divisors
292
475Music festival
330
476Circle Packing II
325
477Number Sequence Game
191
478Mixtures
129
479Roots on the Rise
960
480The Last Question
434
481Chef Showdown
173
482The incenter of a triangle
157
483Repeated permutation
140
484Arithmetic Derivative
204
485Maximum number of divisors
864
486Palindrome-containing strings
187
487Sums of power sums
479
488Unbalanced Nim
180
489Common factors between two sequences
157
490Jumping frog
191
491Double pandigital number divisible by 11
1599
492Exploding sequence
252
493Under The Rainbow
3874
494Collatz prefix families
151
495Writing n as the product of k distinct positive integers
185
496Incenter and circumcenter of triangle
213
497Drunken Tower of Hanoi
360
498Remainder of polynomial division
363
499St. Petersburg Lottery
222
500Problem 500!!!
2949