A165557 - OEIS

A165557

Primes of the form (p^2-1)/4-p where p are also primes.

5, 19, 29, 71, 109, 181, 379, 419, 811, 1259, 1481, 2549, 2861, 3079, 4159, 4691, 7309, 8009, 8929, 13339, 17029, 18089, 19739, 21169, 23869, 24179, 27059, 35531, 37441, 39799, 41411, 43889, 46439, 47741, 48619, 53129, 59779, 61751, 67339, 89101, 93329

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OFFSET

1,1

COMMENTS

The associated primes p are in A165349.

LINKS

Vincenzo Librandi, Table of n, a(n) for n = 1..1000

EXAMPLE

a(1) = 5 = (7^2-1)/4-7 generated by A165349(1)=7.

a(2) = 19 = (11^2-1)/4-11 generated by A165349(2)=11.

MATHEMATICA

Select[Table[(p^2 - 1)/4 - p, {p, Prime[Range[200]]}], PrimeQ] (* Vincenzo Librandi, Oct 12 2012 *)