OFFSET
1,2
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
Select[Range[500], PrimeQ[3#^2-1]&] (* Harvey P. Dale, Oct 09 2011 *)
PROG
(PARI) is(n)=isprime(3*n^2-1) \\ Charles R Greathouse IV, Jun 05 2017
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Giovanni Teofilatto, Jan 05 2004
EXTENSIONS
More terms from Rick L. Shepherd, May 18 2005
STATUS
approved