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A089257
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Even numbers n such that 2n-5 is a prime of the form 4k+3.
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2
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4, 6, 8, 12, 14, 18, 24, 26, 32, 36, 38, 42, 44, 54, 56, 66, 68, 72, 78, 84, 86, 92, 98, 102, 108, 114, 116, 122, 128, 134, 138, 144, 156, 158, 168, 176, 182, 186, 192, 194, 212, 218, 222, 224, 234, 236, 242, 246, 248, 252, 254, 264, 276, 284, 288, 296, 302, 306
(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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LINKS
| Harvey P. Dale, Table of n, a(n) for n = 1..1000
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MATHEMATICA
| pf4kQ[n_]:=Module[{c=2n-5}, PrimeQ[c]&&IntegerQ[(c-3)/4]]; Select[Range[ 2, 400, 2], pf4kQ] (* From Harvey P. Dale, Oct 22 2011 *)
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CROSSREFS
| Cf. A002145.
Sequence in context: A175088 A055670 A141096 * A113451 A029709 A046458
Adjacent sequences: A089254 A089255 A089256 * A089258 A089259 A089260
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KEYWORD
| easy,nonn
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AUTHOR
| Giovanni Teofilatto (g.teofilatto(AT)tiscalinet.it), Dec 12 2003
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EXTENSIONS
| More terms from R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Apr 22 2010
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