A125020 a(n) = (A124983(n)-1)/4.

0, 2, 11, 12, 20, 29, 30, 38, 61, 65, 83, 90, 92, 101, 110, 119, 132, 137, 151, 159, 164, 182, 200, 208, 218, 227, 240, 245, 254, 263, 272, 308, 335, 344, 353, 355, 389, 393, 407, 434, 443, 451, 453, 462, 502, 514, 515, 524, 542, 551, 552, 578, 587, 600, 605, 623

Offset: 1

Author

Artur Jasinski, Nov 16 2006

Keywords

• nonn

Links

• Amiram Eldar, Table of n, a(n) for n = 1..10000

Crossrefs

Cf. A124983, A002145, A124982, A124983.

Programs

Mathematica

Select[Range[0, 600], !PrimeQ[4*# + 1] && Length @ PowersRepresentations[4*# + 1, 2, 2] == 1 &] (* Amiram Eldar, Mar 12 2020 *)

Extensions

More terms from Amiram Eldar, Mar 12 2020