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A173553 Numbers n such that 5+38*n^2 is not a prime. 4
5, 10, 14, 15, 18, 20, 25, 27, 28, 30, 35, 40, 41, 42, 43, 44, 45, 46, 47, 50, 51, 52, 55, 57, 60, 65, 67, 68, 69, 70, 72, 73, 74, 75, 76, 80, 81, 85, 87, 89, 90, 91, 92, 94, 95, 97, 98, 100, 101, 102, 103, 105, 107, 109, 110, 111, 112, 113, 115, 117, 120, 121, 124, 125, 126, 127 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

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

MATHEMATICA

Select[Range[150], !PrimeQ[5 + 38 #^2]&] (* Vincenzo Librandi, Apr 05 2013 *)

PROG

(Magma) [n: n in [1..150] | not IsPrime(5 + 38*n^2)]; // Vincenzo Librandi, Apr 05 2013

CROSSREFS

Cf. A173552, A173554, A173555.

Sequence in context: A119139 A313451 A164889 * A226153 A275991 A313452

Adjacent sequences: A173550 A173551 A173552 * A173554 A173555 A173556

KEYWORD

nonn,easy

AUTHOR

Vincenzo Librandi, Feb 21 2010

EXTENSIONS

Entries recomputed by Alonso Del Arte and N. J. A. Sloane, Jun 18 2010

STATUS

approved

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Last modified December 2 12:19 EST 2022. Contains 358493 sequences. (Running on oeis4.)