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Problems Archives

The problems archives table shows problems 1 to 670. 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
1162
452Long Products
469
453Lattice Quadrilaterals
180
454Diophantine reciprocals III
375
455Powers With Trailing Digits
587
456Triangles containing the origin II
332
457A polynomial modulo the square of a prime
618
458Permutations of Project
730
459Flipping game
187
460An ant on the move
276
461Almost Pi
993
462Permutation of 3-smooth numbers
251
463A weird recurrence relation
883
464Möbius function and intervals
250
465Polar polygons
174
466Distinct terms in a multiplication table
254
467Superinteger
354
468Smooth divisors of binomial coefficients
213
469Empty chairs
612
470Super Ramvok
184
471Triangle inscribed in ellipse
174
472Comfortable Distance II
222
473Phigital number base
621
474Last digits of divisors
324
475Music festival
358
476Circle Packing II
347
477Number Sequence Game
213
478Mixtures
143
479Roots on the Rise
1027
480The Last Question
474
481Chef Showdown
189
482The incenter of a triangle
169
483Repeated permutation
153
484Arithmetic Derivative
227
485Maximum number of divisors
931
486Palindrome-containing strings
203
487Sums of power sums
517
488Unbalanced Nim
191
489Common factors between two sequences
174
490Jumping frog
213
491Double pandigital number divisible by 11
1738
492Exploding sequence
276
493Under The Rainbow
4324
494Collatz prefix families
160
495Writing n as the product of k distinct positive integers
208
496Incenter and circumcenter of triangle
234
497Drunken Tower of Hanoi
393
498Remainder of polynomial division
402
499St. Petersburg Lottery
240
500Problem 500!!!
3229