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A090696 Numbers k such that k^2-11 is a prime. 5
4, 8, 10, 18, 20, 28, 32, 38, 42, 48, 52, 62, 70, 78, 80, 90, 118, 120, 130, 148, 158, 160, 172, 182, 200, 210, 218, 228, 230, 232, 238, 248, 252, 258, 260, 262, 270, 272, 290, 298, 300, 302, 318, 340, 342, 350, 358, 360, 370, 372, 378, 388, 398, 410, 412, 420 (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

Table of n, a(n) for n=1..56.

FORMULA

a(n) = 2*A091271(n).

MATHEMATICA

Select[Range[4, 1200], PrimeQ[#^2-11]&] (* Vladimir Joseph Stephan Orlovsky, Feb 27 2011*)

CROSSREFS

A091272 gives primes, A091273 gives prime index.

Sequence in context: A311008 A311009 A311010 * A048247 A276607 A130442

Adjacent sequences:  A090693 A090694 A090695 * A090697 A090698 A090699

KEYWORD

nonn

AUTHOR

Giovanni Teofilatto, Dec 20 2003

EXTENSIONS

Extended by Ray Chandler, Dec 27 2003

STATUS

approved

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Last modified September 23 19:43 EDT 2018. Contains 315285 sequences. (Running on oeis4.)