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Problems Archives

The problems archives table shows problems 1 to 621. 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
1045
452Long Products
417
453Lattice Quadrilaterals
167
454Diophantine reciprocals III
352
455Powers With Trailing Digits
528
456Triangles containing the origin II
311
457A polynomial modulo the square of a prime
551
458Permutations of Project
643
459Flipping game
177
460An ant on the move
258
461Almost Pi
886
462Permutation of 3-smooth numbers
219
463A weird recurrence relation
803
464Möbius function and intervals
215
465Polar polygons
161
466Distinct terms in a multiplication table
219
467Superinteger
321
468Smooth divisors of binomial coefficients
188
469Empty chairs
537
470Super Ramvok
170
471Triangle inscribed in ellipse
154
472Comfortable Distance II
198
473Phigital number base
548
474Last digits of divisors
275
475Music festival
320
476Circle Packing II
318
477Number Sequence Game
187
478Mixtures
129
479Roots on the Rise
909
480The Last Question
420
481Chef Showdown
174
482The incenter of a triangle
154
483Repeated permutation
143
484Arithmetic Derivative
184
485Maximum number of divisors
828
486Palindrome-containing strings
185
487Sums of power sums
444
488Unbalanced Nim
179
489Common factors between two sequences
158
490Jumping frog
177
491Double pandigital number divisible by 11
1506
492Exploding sequence
237
493Under The Rainbow
3530
494Collatz prefix families
149
495Writing n as the product of k distinct positive integers
158
496Incenter and circumcenter of triangle
207
497Drunken Tower of Hanoi
342
498Remainder of polynomial division
342
499St. Petersburg Lottery
214
500Problem 500!!!
2700