OFFSET
1,8
COMMENTS
13, 33, 52, 59, 69, 86, 96, 99, 106 etc. are not in the sequence.
PROG
(PARI) a(n) = prime(n)\9; \\ Michel Marcus, Sep 25 2015
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Paul Curtz, Jan 22 2009
EXTENSIONS
Edited and extended by R. J. Mathar, Feb 27 2009
STATUS
approved