a(2) = 113: y = x^2+17x+113.
If x = 0; y = 0+0+113 = 113, which is prime.
If x = 1; y = 1+17+113 = 131, which is prime.
If x = 2; y = 4+34+113 = 151, which is prime.
If x = 3; y = 9+51+113 = 173, which is prime.
If x = 4; y = 16+68+113 = 197, which is prime.
If x = 5; y = 25+85+113 = 223, which is prime.
If x = 6; y = 36+102+113 = 251, which is prime.
If x = 7; y = 49+119+113 = 281, which is prime.
If x = 8; y = 64+136+113 = 313, which is prime.
If x = 9; y = 81+153+113 = 347, which is prime.
