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A033868 Numbers n such that 7*n-11 is prime. 9
2, 4, 6, 10, 12, 16, 24, 30, 34, 36, 40, 42, 46, 52, 54, 60, 70, 76, 82, 84, 90, 94, 96, 112, 114, 120, 124, 136, 142, 144, 150, 160, 162, 166, 172, 180, 184, 186, 190, 196, 210, 214, 222, 226, 232, 234, 240, 244, 252, 262, 270, 274, 280, 300, 306, 322, 336, 342 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

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

FORMULA

a(n) = A024903(n)+1 = A089033(n)+2 = A090614(n)*2+2.

MATHEMATICA

Select[Range[500], PrimeQ[7#-11]&]  (* Harvey P. Dale, Mar 31 2011 *)

PROG

(MAGMA) [n: n in [0..350] | IsPrime(7*n - 11)]; // Vincenzo Librandi, Sep 26 2012

(PARI) is(n)=isprime(7*n-11) \\ Charles R Greathouse IV, Feb 17 2017

CROSSREFS

Cf. A045437 (associated primes), A090613 (gives prime index).

Cf. A024903, A089033, A090614.

Sequence in context: A024907 A033098 A220478 * A045954 A072542 A167856

Adjacent sequences:  A033865 A033866 A033867 * A033869 A033870 A033871

KEYWORD

nonn,easy

AUTHOR

Giovanni Teofilatto, Dec 01 2003

EXTENSIONS

Extended by Ray Chandler, Dec 23 2003

Offset corrected by Arkadiusz Wesolowski, Aug 09 2011

STATUS

approved

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Last modified March 26 18:36 EDT 2019. Contains 321511 sequences. (Running on oeis4.)