A086304 Numbers n such that n+6 is prime.

1, 5, 7, 11, 13, 17, 23, 25, 31, 35, 37, 41, 47, 53, 55, 61, 65, 67, 73, 77, 83, 91, 95, 97, 101, 103, 107, 121, 125, 131, 133, 143, 145, 151, 157, 161, 167, 173, 175, 185, 187, 191, 193, 205, 217, 221, 223, 227, 233, 235, 245, 251, 257, 263, 265, 271, 275, 277

Offset: 1

Author

Giovanni Teofilatto, Aug 29 2003

Keywords

• nonn
• easy

References

• M. Cerasoli, F. Eugeni and M. Protasi, Elementi di Matematica Discreta, Bologna 1988
• Emanuele Munarini and Norma Zagaglia Salvi, Matematica Discreta, UTET, CittaStudiEdizioni, Milano 1997

Links

• Vincenzo Librandi, Table of n, a(n) for n = 1..1000

Crossrefs

Cf. A089038.

Programs

Magma

[n: n in [0..300]| IsPrime(n + 6)]; // Vincenzo Librandi, Oct 16 2012

Mathematica

Select[Range[0, 900], PrimeQ[# + 6] &] (* Vincenzo Librandi, Oct 16 2012 *)

PARI

is(n)=isprime(n+6) \\ Charles R Greathouse IV, May 22 2017

Formula

a(n) = 2*A089038(n+1)-1.

Extensions

Corrected and extended by Ray Chandler, Nov 29 2003