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A090696
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Numbers n such that n^2-11 is a prime.
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4
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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; internal format)
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OFFSET
| 1,1
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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
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FORMULA
| a(n)=2*A091271(n).
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MATHEMATICA
| Select[Range[4, 1200], PrimeQ[#^2-11]&] (*From Vladimir Joseph Stephan Orlovsky, Feb 27 2011*)
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CROSSREFS
| A091272 gives primes, A091273 gives prime index.
Sequence in context: A020209 A046559 A032618 * A048247 A130442 A031073
Adjacent sequences: A090693 A090694 A090695 * A090697 A090698 A090699
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KEYWORD
| nonn
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AUTHOR
| Giovanni Teofilatto (g.teofilatto(AT)tiscalinet.it), Dec 20 2003
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EXTENSIONS
| Extended by Ray Chandler (rayjchandler(AT)sbcglobal.net), Dec 27 2003
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