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A201854 Primes of the form 7n^2 - 9. 1

%I

%S 19,103,439,691,1783,2791,4723,5479,7159,10099,17491,18919,21943,

%T 23539,28663,32359,40423,47059,59239,61843,67219,69991,75703,78643,

%U 84691,97459,104179,114679,125683,137191,153319,192883,202291,207079

%N Primes of the form 7n^2 - 9.

%H Vincenzo Librandi, <a href="/A201854/b201854.txt">Table of n, a(n) for n = 1..5000</a>

%t Select[Table[7n^2-9,{n,2,1000}],PrimeQ]

%o (MAGMA) [a: n in [2..200] | IsPrime(a) where a is 7*n^2-9];

%K nonn,easy

%O 1,1

%A _Vincenzo Librandi_, Dec 06 2011

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Last modified May 19 18:35 EDT 2022. Contains 353847 sequences. (Running on oeis4.)