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A155028 Primes p such that p^3 + 2*p^2 + p + 1 is also prime. 1
2, 5, 7, 13, 23, 47, 79, 89, 103, 109, 137, 139, 193, 223, 229, 257, 277, 293, 317, 347, 379, 389, 443, 457, 499, 593, 607, 653, 677, 709, 733, 823, 853, 883, 907, 953, 1013, 1033, 1087, 1103, 1117, 1283, 1297, 1307, 1327, 1367, 1409, 1489, 1523, 1549, 1597 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

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

MATHEMATICA

Select[Prime[Range[1600]], PrimeQ[(#^3 + 2*#^2 + # + 1)]&] (* Vincenzo Librandi, Oct 30 2012 *)

PROG

(MAGMA) [p: p in PrimesUpTo(1600)| IsPrime(p^3 + 2*p^2 + p + 1)]; // Vincenzo Librandi, Oct 30 2012

CROSSREFS

Cf. A154686.

Sequence in context: A094712 A095281 A106889 * A119839 A107057 A212319

Adjacent sequences:  A155025 A155026 A155027 * A155029 A155030 A155031

KEYWORD

nonn,easy

AUTHOR

Vincenzo Librandi, Jan 19 2009

STATUS

approved

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Last modified September 24 22:27 EDT 2018. Contains 315360 sequences. (Running on oeis4.)