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A090696
Numbers k such that k^2 - 11 is a prime.
7
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
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
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 A338312
KEYWORD
nonn
AUTHOR
Giovanni Teofilatto, Dec 20 2003
EXTENSIONS
Extended by Ray Chandler, Dec 27 2003
STATUS
approved