A023298 Primes that remain prime through 3 iterations of function f(x) = 9x + 8.

11, 61, 251, 397, 467, 727, 907, 1747, 1901, 2221, 2617, 3121, 3527, 3581, 4001, 4099, 4211, 4759, 5231, 5717, 6277, 6661, 6689, 7237, 7877, 8117, 8171, 8581, 9371, 9587, 11171, 12457, 12539, 13109, 14221, 15187, 15731, 16069, 16477, 16979, 17117, 17491

Offset: 1

Author

David W. Wilson

Keywords

• nonn

Comments

Primes p such that 9*p+8, 81*p+80, and 729*p+728 are also primes. - Vincenzo Librandi, Aug 04 2010

Links

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

Crossrefs

Subsequence of A023235 and A023267.

Programs

Magma

[n: n in [1..450000] | IsPrime(n) and IsPrime(9*n+8) and IsPrime(81*n+80) and IsPrime(729*n+728)]; // Vincenzo Librandi, Aug 04 2010