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IDDescription / TitleSolved By
451Modular inverses
452Long Products
453Lattice Quadrilaterals
454Diophantine reciprocals III
455Powers With Trailing Digits
456Triangles containing the origin II
457A polynomial modulo the square of a prime
458Permutations of Project
459Flipping game
460An ant on the move
461Almost Pi
462Permutation of 3-smooth numbers
463A weird recurrence relation
464Möbius function and intervals
465Polar polygons
466Distinct terms in a multiplication table
468Smooth divisors of binomial coefficients