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Problems Archives

The problems archives table shows problems 1 to 679. 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
1180
452Long Products
472
453Lattice Quadrilaterals
186
454Diophantine reciprocals III
377
455Powers With Trailing Digits
596
456Triangles containing the origin II
339
457A polynomial modulo the square of a prime
632
458Permutations of Project
749
459Flipping game
190
460An ant on the move
281
461Almost Pi
1005
462Permutation of 3-smooth numbers
257
463A weird recurrence relation
898
464Möbius function and intervals
252
465Polar polygons
179
466Distinct terms in a multiplication table
260
467Superinteger
359
468Smooth divisors of binomial coefficients
216
469Empty chairs
623
470Super Ramvok
190
471Triangle inscribed in ellipse
174
472Comfortable Distance II
222
473Phigital number base
627
474Last digits of divisors
327
475Music festival
367
476Circle Packing II
349
477Number Sequence Game
216
478Mixtures
146
479Roots on the Rise
1045
480The Last Question
481
481Chef Showdown
191
482The incenter of a triangle
169
483Repeated permutation
160
484Arithmetic Derivative
235
485Maximum number of divisors
946
486Palindrome-containing strings
204
487Sums of power sums
525
488Unbalanced Nim
196
489Common factors between two sequences
176
490Jumping frog
221
491Double pandigital number divisible by 11
1771
492Exploding sequence
283
493Under The Rainbow
4414
494Collatz prefix families
166
495Writing n as the product of k distinct positive integers
209
496Incenter and circumcenter of triangle
241
497Drunken Tower of Hanoi
402
498Remainder of polynomial division
407
499St. Petersburg Lottery
248
500Problem 500!!!
3290