7 * 5 2 * 13 3 July 8, 2019 16 32 64 128 13 2 5 7 x 3 9 13 2x 5 2 3x 7 2 3 5 7 13 prime numbers 8697 - 3 mũ 7 3 mũ 5 2 13 3 )
