A165353 - OEIS

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A165353

Primes p such that p+(p^2-1)/8 is a prime number.

7, 17, 23, 31, 41, 71, 73, 79, 103, 113, 127, 151, 191, 233, 257, 281, 311, 337, 367, 383, 409, 433, 463, 487, 569, 577, 593, 601, 607, 647, 809, 887, 911, 953, 977, 1039, 1049, 1087, 1097, 1153, 1193, 1201, 1223, 1279, 1297, 1321, 1361, 1399, 1433, 1481, 1487

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,1

LINKS

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

FORMULA

a(n)+(a(n)^2-1)/8 = A165352(n).

MATHEMATICA

Select[Prime[Range[250]], PrimeQ[# + (#^2 - 1)/8] &] (* Vincenzo Librandi, Sep 01 2012 *)

PROG

(Magma) [n: n in [3..1500] |IsPrime(n) and IsPrime(n+(n^2-1) div 8)]; // Vincenzo Librandi, Sep 01 2012

CROSSREFS