A154405 Primes of the form 20n^2+8n+1.

29, 97, 353, 541, 769, 1693, 2081, 4621, 8161, 9857, 13729, 14797, 17053, 19469, 24781, 26209, 32321, 35617, 42689, 48413, 54497, 65437, 72481, 77377, 85021, 87649, 95773, 98561, 125453, 141793, 148609, 152077, 166349, 177473, 185089

Offset

1,1

Links

Vincenzo Librandi, Table of n, a(n) for n = 1..10000

Example

For n=1, a(1)=29; n=2, a(2)=97

Mathematica

Select[Table[20n^2+8n+1, {n, 0, 600}], PrimeQ]

Prog

(Magma) [a: n in [0..200] | IsPrime(a) where a is 20*n^2+8*n+1];

Crossrefs

Cf. A017293

Sequence in context: A044216 A044597 A138625 * A092373 A240954 A087641

Adjacent sequences: A154402 A154403 A154404 * A154406 A154407 A154408

Keyword

nonn,easy

Author

Vincenzo Librandi, Jan 09 2009

Extensions

12701 removed, 32321 inserted, 18609 replaced by 148609 - R. J. Mathar, Feb 19 2009

Misleading formula removed - R. J. Mathar, Oct 18 2010

Status

approved