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
Daniel Starodubtsev, Table of n, a(n) for n = 1..10000
PROG
(PARI) is(n)=isprime(3*n+7) \\ Charles R Greathouse IV, May 22 2017
CROSSREFS
KEYWORD
nonn
AUTHOR
Giovanni Teofilatto, Jan 12 2004
EXTENSIONS
Offset corrected by Arkadiusz Wesolowski, Aug 09 2011
STATUS
approved