A023249 Primes that remain prime through 2 iterations of function f(x) = 3x + 10.

3, 7, 11, 17, 19, 47, 67, 109, 149, 151, 199, 227, 233, 347, 353, 359, 397, 431, 457, 487, 563, 571, 577, 607, 709, 809, 919, 947, 997, 1013, 1033, 1069, 1103, 1117, 1151, 1187, 1279, 1361, 1367, 1451, 1601, 1607, 1697, 1699, 1801, 1811, 1823, 1831, 1871, 1913

Offset: 1

Author

David W. Wilson

Keywords

• nonn

Comments

Primes p such that 3*p+10 and 9*p+40 are also primes. - Vincenzo Librandi, Aug 04 2010

Links

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

Crossrefs

Subsequence of A023211.

Programs

Magma

[n: n in [0..100000] | IsPrime(n) and IsPrime(3*n+10) and IsPrime(9*n+40)] // Vincenzo Librandi, Aug 04 2010

Mathematica

Select[Range@ 2000, Times @@ Boole@ PrimeQ@ NestList[3 # + 10 &, #, 2] > 0 &] (* Michael De Vlieger, Sep 13 2016 *)