A074367 (p^2-5)/4 for odd primes p.

1, 5, 11, 29, 41, 71, 89, 131, 209, 239, 341, 419, 461, 551, 701, 869, 929, 1121, 1259, 1331, 1559, 1721, 1979, 2351, 2549, 2651, 2861, 2969, 3191, 4031, 4289, 4691, 4829, 5549, 5699, 6161, 6641, 6971, 7481, 8009, 8189, 9119, 9311, 9701, 9899, 11129

Offset: 1

Author

Roger L. Bagula, Sep 23 2002

Keywords

• nonn
• easy

Crossrefs

a(n) = A024701(n)-1.

Programs

Mathematica

a[n_] := (Prime[n+1]^2-5)/4
(#^2-5)/4&/@Prime[Range[2,50]] (* Harvey P. Dale, Jan 15 2019 *)

Extensions

Edited by Dean Hickerson, Oct 09 2002