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Problems Archives

The problems archives table shows problems 1 to 617. 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
1052
452Long Products
416
453Lattice Quadrilaterals
166
454Diophantine reciprocals III
348
455Powers With Trailing Digits
528
456Triangles containing the origin II
314
457A polynomial modulo the square of a prime
548
458Permutations of Project
635
459Flipping game
174
460An ant on the move
260
461Almost Pi
883
462Permutation of 3-smooth numbers
225
463A weird recurrence relation
808
464Möbius function and intervals
214
465Polar polygons
160
466Distinct terms in a multiplication table
222
467Superinteger
323
468Smooth divisors of binomial coefficients
191
469Empty chairs
534
470Super Ramvok
170
471Triangle inscribed in ellipse
157
472Comfortable Distance II
203
473Phigital number base
543
474Last digits of divisors
273
475Music festival
315
476Circle Packing II
321
477Number Sequence Game
188
478Mixtures
138
479Roots on the Rise
903
480The Last Question
422
481Chef Showdown
177
482The incenter of a triangle
157
483Repeated permutation
142
484Arithmetic Derivative
187
485Maximum number of divisors
814
486Palindrome-containing strings
188
487Sums of power sums
440
488Unbalanced Nim
179
489Common factors between two sequences
158
490Jumping frog
178
491Double pandigital number divisible by 11
1477
492Exploding sequence
237
493Under The Rainbow
3439
494Collatz prefix families
157
495Writing n as the product of k distinct positive integers
157
496Incenter and circumcenter of triangle
208
497Drunken Tower of Hanoi
345
498Remainder of polynomial division
343
499St. Petersburg Lottery
228
500Problem 500!!!
2646