2 1 5 15 6 July 8, 2019 16 32 64 128 1 2 5 6 x 12 15 8p 2 1 5 30p 15 )-( 6p 2 9 1 5 2b 2b 2 6b 15 1 5 5x 15 )= 1 2 4x 6 2 5 1 5 x 15 6
