Problems


IDDescription / Title
451
Modular inverses
452
Long Products
453
Lattice Quadrilaterals
454
Diophantine reciprocals III
455
Powers With Trailing Digits
456
Triangles containing the origin II
457
A polynomial modulo the square of a prime
458
Permutations of Project
459
Flipping game
460
An ant on the move
461
Almost Pi
462
Permutation of 3-smooth numbers
463
A weird recurrence relation
464
Möbius function and intervals
465
Polar polygons
466
Distinct terms in a multiplication table
467
Superinteger
468
Smooth divisors of binomial coefficients
469
Empty chairs
470
Super Ramvok
471
Triangle inscribed in ellipse
472
Comfortable Distance II
473
Phigital number base
474
Last digits of divisors
475
Music festival
476
Circle Packing II
477
Number Sequence Game
478
Mixtures
479
Roots on the Rise
480
The Last Question
481
Chef Showdown
482
The incenter of a triangle
483
Repeated permutation
484
Arithmetic Derivative
485
Maximum number of divisors
486
Palindrome-containing strings
487
Sums of power sums
488
Unbalanced Nim
489
Common factors between two sequences
490
Jumping frog
491
Double pandigital number divisible by 11
492
Exploding sequence
493
Under The Rainbow
494
Collatz prefix families
495
Writing n as the product of k distinct positive integers
496
Incenter and circumcenter of triangle
497
Drunken Tower of Hanoi
498
Remainder of polynomial division
499
St. Petersburg Lottery
500
Problem 500!!!