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Problems Archives

The problems archives table shows problems 1 to 632. 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
1073
452Long Products
419
453Lattice Quadrilaterals
164
454Diophantine reciprocals III
350
455Powers With Trailing Digits
532
456Triangles containing the origin II
313
457A polynomial modulo the square of a prime
557
458Permutations of Project
662
459Flipping game
174
460An ant on the move
254
461Almost Pi
908
462Permutation of 3-smooth numbers
221
463A weird recurrence relation
815
464Möbius function and intervals
217
465Polar polygons
154
466Distinct terms in a multiplication table
221
467Superinteger
322
468Smooth divisors of binomial coefficients
190
469Empty chairs
552
470Super Ramvok
167
471Triangle inscribed in ellipse
158
472Comfortable Distance II
198
473Phigital number base
555
474Last digits of divisors
283
475Music festival
327
476Circle Packing II
321
477Number Sequence Game
187
478Mixtures
127
479Roots on the Rise
944
480The Last Question
424
481Chef Showdown
171
482The incenter of a triangle
153
483Repeated permutation
139
484Arithmetic Derivative
196
485Maximum number of divisors
848
486Palindrome-containing strings
185
487Sums of power sums
469
488Unbalanced Nim
177
489Common factors between two sequences
153
490Jumping frog
182
491Double pandigital number divisible by 11
1572
492Exploding sequence
244
493Under The Rainbow
3748
494Collatz prefix families
152
495Writing n as the product of k distinct positive integers
177
496Incenter and circumcenter of triangle
210
497Drunken Tower of Hanoi
353
498Remainder of polynomial division
353
499St. Petersburg Lottery
217
500Problem 500!!!
2872