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
Examples
For n=1, a(1)=29; n=2, a(2)=97
Links
- Vincenzo Librandi, Table of n, a(n) for n = 1..10000
Crossrefs
Cf. A017293
Programs
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Magma
[a: n in [0..200] | IsPrime(a) where a is 20*n^2+8*n+1];
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Mathematica
Select[Table[20n^2+8n+1,{n,0,600}],PrimeQ]
Extensions
12701 removed, 32321 inserted, 18609 replaced by 148609 - R. J. Mathar, Feb 19 2009
Misleading formula removed - R. J. Mathar, Oct 18 2010