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A155152 Numbers n such that 13n^2+3n+1 is prime. 3
1, 2, 3, 6, 7, 8, 11, 13, 14, 15, 19, 20, 22, 23, 24, 26, 34, 37, 39, 40, 41, 42, 44, 46, 47, 48, 51, 53, 57, 62, 63, 64, 66, 68, 73, 74, 75, 79, 88, 91, 94, 96, 97, 99, 102, 107, 111, 112, 116, 122, 133, 135, 144, 146, 152, 161, 162, 163, 165, 166, 167, 172, 180, 183, 184, 187 (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[200], PrimeQ[13#^2+3#+1]&] (* Harvey P. Dale, Dec 08 2011 *)

PROG

(MAGMA) [n: n in [0..200] | IsPrime(13*n^2+3*n+1)]; // Vincenzo Librandi, Sep 24 2012

(PARI) is(n)=isprime(13*n^2+3*n+1) \\ Charles R Greathouse IV, May 22 2017

CROSSREFS

Cf. A155153.

Sequence in context: A001422 A097757 A304028 * A098740 A116046 A069579

Adjacent sequences:  A155149 A155150 A155151 * A155153 A155154 A155155

KEYWORD

nonn,easy

AUTHOR

Vincenzo Librandi, Jan 21 2009

EXTENSIONS

Definition corrected and terms recomputed by Jon E. Schoenfield and N. J. A. Sloane, Jun 16 2010

STATUS

approved

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Last modified October 18 11:19 EDT 2021. Contains 348067 sequences. (Running on oeis4.)