A179262 a(n) = 2*prime(n)^2 - 1.

7, 17, 49, 97, 241, 337, 577, 721, 1057, 1681, 1921, 2737, 3361, 3697, 4417, 5617, 6961, 7441, 8977, 10081, 10657, 12481, 13777, 15841, 18817, 20401, 21217, 22897, 23761, 25537, 32257, 34321, 37537, 38641, 44401, 45601, 49297, 53137, 55777

Offset: 1

Author

Frank Wals (frank.wals(AT)gmail.com), Jul 06 2010, Jul 09 2010

Keywords

• nonn

Links

• Michael De Vlieger, Table of n, a(n) for n = 1..10000

Crossrefs

Cf. A000040.

Programs

Mathematica

Array[2 Prime[#]^2 - 1 &, 10^4] (* Michael De Vlieger, Oct 06 2019 *)

Formula

a(n) = A079704(n) - 1 = 2*prime(n)^2 - 1. - R. J. Mathar, Jul 08 2010

Extensions

More terms from R. J. Mathar, Jul 08 2010