A089257 Even numbers n such that 2n-5 is a prime of the form 4k+3.

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

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

Harvey P. Dale, Table of n, a(n) for n = 1..1000

Mathematica

pf4kQ[n_]:=Module[{c=2n-5}, PrimeQ[c]&&IntegerQ[(c-3)/4]]; Select[Range[ 2, 400, 2], pf4kQ] (* Harvey P. Dale, Oct 22 2011 *)

Crossrefs

Cf. A002145.

Sequence in context: A370745 A055670 A141096 * A113451 A270191 A029709

Adjacent sequences: A089254 A089255 A089256 * A089258 A089259 A089260

Keyword

easy,nonn

Author

Giovanni Teofilatto, Dec 12 2003

Extensions

More terms from R. J. Mathar, Apr 22 2010

Status

approved