(13, 161, 3), (17, 281, 7), ?

(11, 115, 8) (11, 113, 1) (15, 117, 9) (18, 296, 10)

(11, 113, 1)

(13)2 = 169 - 8                 1 × 3 = 3 (17)2 = 289 - 8                 1 × 7 = 7 (11)2 = 121 - 8 = 113       1 × 1 = 1