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A173555 Primes p such that 5+38*p^2 is also prime. 4
2, 3, 7, 11, 13, 17, 19, 23, 29, 31, 37, 53, 59, 61, 71, 79, 83, 137, 139, 149, 151, 157, 163, 167, 181, 191, 193, 199, 211, 223, 227, 229, 239, 269, 281, 283, 307, 311, 313, 317, 347, 353, 359, 367, 379, 383, 389, 401, 419, 491, 509, 521, 523, 541, 557 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Bruno Berselli, Table of n, a(n) for n = 1..1000

MATHEMATICA

Select[Prime[Range[200]], PrimeQ[5+38#^2]&] (* Harvey P. Dale, Jul 24 2011 *)

PROG

(MAGMA) [p: p in PrimesUpTo(1000) | IsPrime(5+38*p^2)]; // Vincenzo Librandi, Sep 13 2015

(PARI) lista(nn) = forprime(p=2, nn, if (isprime(5+38*p^2), print1(p, ", "))); \\ Michel Marcus, Sep 13 2015

CROSSREFS

Subsequence of A173552.

Cf. A173553, A173554.

Sequence in context: A038613 A075235 A020634 * A086339 A181173 A216277

Adjacent sequences:  A173552 A173553 A173554 * A173556 A173557 A173558

KEYWORD

nonn,easy

AUTHOR

Vincenzo Librandi, Feb 21 2010

EXTENSIONS

Edited, corrected and extended by Alonso del Arte and N. J. A. Sloane, Jun 18 2010

STATUS

approved

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Last modified July 26 18:16 EDT 2017. Contains 289839 sequences.