3 7 x 7 15 July 8, 2019 16 32 64 128 7 3 x 5 7 15 3 х 7 15 3 x 7 )- 15 27 3 7 x 150 3 7 x 15 12 3 7 x 15 2x 0 3 7 x 15 98 156 7 3 x 7 5 x 7 = 35 3 7 15 31 series 3 x 7/15
