A154405 - OEIS

%I #10 Sep 08 2022 08:45:40

%S 29,97,353,541,769,1693,2081,4621,8161,9857,13729,14797,17053,19469,

%T 24781,26209,32321,35617,42689,48413,54497,65437,72481,77377,85021,

%U 87649,95773,98561,125453,141793,148609,152077,166349,177473,185089

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

%H Vincenzo Librandi, <a href="/A154405/b154405.txt">Table of n, a(n) for n = 1..10000</a>

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

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

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

%Y Cf. A017293

%K nonn,easy

%O 1,1

%A _Vincenzo Librandi_, Jan 09 2009

%E 12701 removed, 32321 inserted, 18609 replaced by 148609 - _R. J. Mathar_, Feb 19 2009

%E Misleading formula removed - _R. J. Mathar_, Oct 18 2010