MathDB
Prove that 8b+1 is composite

Source: Russian TST 2018, Day 9 P1 (Groups A & B)

March 30, 2023
number theory

Problem Statement

The natural numbers a>ba > b are such that a−b=5b2−4a2a-b=5b^2-4a^2. Prove that the number 8b+18b + 1 is composite.
Back to ProblemsView on AoPS