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A155736 Numbers n such that 4*n^2+2*n-1 is a prime. 4
1, 2, 3, 4, 5, 8, 10, 12, 13, 14, 15, 19, 22, 23, 24, 25, 27, 28, 30, 32, 33, 34, 35, 38, 43, 47, 48, 50, 57, 60, 63, 65, 67, 69, 70, 72, 74, 77, 79, 80, 82, 87, 88, 90, 92, 93, 94, 98, 103, 109, 110, 115, 118, 120, 122, 123, 124, 129, 132, 134, 144, 145, 147, 148, 149 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Vincenzo Librandi, Table of n, a(n) for n = 1..1000

MATHEMATICA

Select[Range[0, 200], PrimeQ[4#^2+2#-1]&] (* Vincenzo Librandi, Sep 24 2012 *)

PROG

(MAGMA) [n: n in [0..150] | IsPrime(4*n^2+2*n-1)]; // Vincenzo Librandi, Sep 24 2012

CROSSREFS

Cf. A155737, A155738.

Sequence in context: A309960 A247935 A005233 * A074897 A090556 A223539

Adjacent sequences:  A155733 A155734 A155735 * A155737 A155738 A155739

KEYWORD

nonn,easy

AUTHOR

Vincenzo Librandi, Jan 26 2009

EXTENSIONS

Edited by N. J. A. Sloane, Jun 25 2010

STATUS

approved

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Last modified February 25 14:40 EST 2021. Contains 341609 sequences. (Running on oeis4.)