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Problems Archives

The problems archives table shows problems 1 to 661. 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
1122
452Long Products
447
453Lattice Quadrilaterals
173
454Diophantine reciprocals III
362
455Powers With Trailing Digits
568
456Triangles containing the origin II
323
457A polynomial modulo the square of a prime
587
458Permutations of Project
696
459Flipping game
179
460An ant on the move
263
461Almost Pi
951
462Permutation of 3-smooth numbers
241
463A weird recurrence relation
852
464Möbius function and intervals
234
465Polar polygons
166
466Distinct terms in a multiplication table
243
467Superinteger
337
468Smooth divisors of binomial coefficients
198
469Empty chairs
591
470Super Ramvok
172
471Triangle inscribed in ellipse
163
472Comfortable Distance II
211
473Phigital number base
589
474Last digits of divisors
302
475Music festival
339
476Circle Packing II
333
477Number Sequence Game
202
478Mixtures
137
479Roots on the Rise
994
480The Last Question
452
481Chef Showdown
179
482The incenter of a triangle
163
483Repeated permutation
145
484Arithmetic Derivative
217
485Maximum number of divisors
892
486Palindrome-containing strings
194
487Sums of power sums
495
488Unbalanced Nim
184
489Common factors between two sequences
163
490Jumping frog
200
491Double pandigital number divisible by 11
1665
492Exploding sequence
269
493Under The Rainbow
4105
494Collatz prefix families
157
495Writing n as the product of k distinct positive integers
199
496Incenter and circumcenter of triangle
224
497Drunken Tower of Hanoi
377
498Remainder of polynomial division
379
499St. Petersburg Lottery
228
500Problem 500!!!
3076