Numbers k such that k^2 + 1 is a Sophie Germain prime.

Terms

a(0) =1a(1) =2a(2) =40a(3) =110a(4) =160a(5) =170a(6) =250a(7) =440a(8) =490a(9) =890a(10) =910a(11) =950a(12) =1070a(13) =1210a(14) =1640a(15) =1660a(16) =1990a(17) =2050a(18) =2080a(19) =2360a(20) =2420a(21) =2470a(22) =3290a(23) =3520a(24) =3890a(25) =4370a(26) =4850a(27) =5180a(28) =5930a(29) =6130