A155703 Primes p such that 2*p^2 + 16*p + 23 is also prime.

3, 7, 13, 19, 31, 43, 97, 127, 223, 241, 271, 283, 307, 397, 421, 439, 577, 601, 619, 661, 673, 691, 727, 853, 859, 967, 1009, 1051, 1063, 1123, 1153, 1237, 1321, 1429, 1447, 1543, 1567, 1597, 1609, 1657, 1669, 1861, 1867, 1933, 1951, 1987, 2017, 2089, 2203

Offset

1,1

Links

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

Mathematica

Select[Prime[Range[2500]], PrimeQ[(2*#^2 + 16*# + 23)]&] (* Vincenzo Librandi, Oct 30 2012 *)

Prog

(Magma) [p: p in PrimesUpTo(3000)|IsPrime(2*p^2+16*p+23)]

Crossrefs

Cf. A155702, A153037.

Sequence in context: A103966 A023237 A106061 * A023217 A106077 A216515

Adjacent sequences: A155700 A155701 A155702 * A155704 A155705 A155706

Keyword

nonn,easy

Author

Vincenzo Librandi, Jan 25 2009

Extensions

Entries confirmed by John W. Layman, Jun 17 2010

Status

approved