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A153781 Numbers n such that n^2+13n+23 is prime. 3
0, 1, 2, 3, 5, 6, 7, 8, 14, 15, 16, 19, 20, 24, 27, 28, 34, 36, 37, 40, 41, 42, 44, 45, 47, 49, 57, 59, 62, 64, 66, 68, 71, 72, 73, 78, 84, 85, 86, 90, 96, 103, 105, 106, 110, 117, 119, 122, 124, 129, 132, 133, 136, 141, 150, 154, 156, 157, 163, 168, 169, 174 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

LINKS

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

MATHEMATICA

Select[Range[0, 900], PrimeQ[#^2 + 13 # + 23] &] (* Vincenzo Librandi, Jul 31 2012 *)

PROG

(MAGMA) [n: n in [0..200]| IsPrime(n^2+13*n+23)]; // Vincenzo Librandi, Jul 31 2012

(PARI) is(n)=isprime(n^2+13*n+23) \\ Charles R Greathouse IV, May 22 2017

CROSSREFS

Cf. A144561.

Sequence in context: A039086 A280060 A197433 * A255398 A050025 A255430

Adjacent sequences:  A153778 A153779 A153780 * A153782 A153783 A153784

KEYWORD

nonn,easy

AUTHOR

Vincenzo Librandi, Jan 03 2009

STATUS

approved

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Last modified August 9 20:09 EDT 2020. Contains 336326 sequences. (Running on oeis4.)