A023240 Primes p such that 10*p + 9 is also prime.

2, 5, 7, 13, 17, 19, 23, 37, 41, 43, 47, 59, 61, 71, 73, 83, 101, 103, 127, 131, 139, 149, 157, 197, 199, 223, 233, 239, 257, 269, 271, 281, 293, 307, 311, 331, 349, 353, 373, 401, 409, 421, 433, 463, 467, 479, 491, 499, 503, 509, 541, 547, 563, 577, 587, 593, 607, 619

Offset

1,1

Links

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

Mathematica

Select[Prime@ Range@ 120, PrimeQ[10 # + 9] &] (* Michael De Vlieger, Sep 12 2016 *)

Prog

(Magma) [ n: n in PrimesUpTo(700) | IsPrime(10*n+9) ]; // Vincenzo Librandi, Nov 20 2010

Crossrefs

Subsequence of A102700.

Sequence in context: A336451 A249330 A069346 * A291284 A023204 A248606

Adjacent sequences: A023237 A023238 A023239 * A023241 A023242 A023243

Keyword

nonn

Author

David W. Wilson

Status

approved