MathDB
MMO 070 Moscow MO 1940 2^x - x^2 is divisible by 7

Source:

July 18, 2019
divisiblenumber theory

Problem Statement

How many positive integers xx less than 1000010 000 are there such that 2xāˆ’x22^x - x^2 is divisible by 77 ?
Back to ProblemsView on AoPS