A023220 Primes p such that 5*p + 8 is also prime.

3, 7, 13, 19, 31, 37, 43, 61, 73, 103, 127, 163, 211, 223, 229, 241, 283, 307, 331, 337, 349, 373, 397, 409, 421, 439, 457, 499, 541, 631, 661, 673, 691, 727, 733, 757, 769, 787, 829, 853, 883, 919, 997, 1021, 1063, 1087, 1123, 1129, 1213, 1231, 1447, 1543, 1549

Offset

1,1

Comments

Except for the first term all others are congruent to 1 (mod 6) because 5*(6*n+5)+8 is divisible by 3. - Zak Seidov, Aug 23 2012

Links

John Cerkan, Table of n, a(n) for n = 1..10000

Mathematica

Select[Prime[Range[250]], PrimeQ[5#+8]&] (* Harvey P. Dale, Apr 21 2020 *)

Prog

(Magma) [n: n in [0..1000] | IsPrime(n) and IsPrime(5*n+8)]; // Vincenzo Librandi, Nov 20 2010

Crossrefs

Cf. A002476, A111225 (supersequence).

Sequence in context: A015916 A023203 A086135 * A207990 A023205 A304874

Adjacent sequences: A023217 A023218 A023219 * A023221 A023222 A023223

Keyword

nonn

Author

David W. Wilson

Status

approved