A023267 Primes that remain prime through 2 iterations of function f(x) = 9x + 8.

7, 11, 19, 61, 97, 107, 131, 181, 251, 271, 397, 401, 419, 467, 557, 601, 677, 727, 907, 929, 1129, 1297, 1439, 1481, 1609, 1699, 1747, 1901, 1931, 2027, 2029, 2099, 2221, 2267, 2357, 2377, 2557, 2617, 2879, 3001, 3019, 3121, 3259, 3371, 3407, 3457, 3527

Offset: 1

Author

David W. Wilson

Keywords

• nonn

Comments

Primes p such that 9*p+8 and 81*p+80 are also primes. - Vincenzo Librandi, Aug 04 2010

Links

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

Crossrefs

Subsequence of A023235.

Programs

Magma

[n: n in [1..100000] | IsPrime(n) and IsPrime(9*n+8) and IsPrime(81*n+80)] // Vincenzo Librandi, Aug 04 2010