OFFSET
1,1
LINKS
Hugo Pfoertner, Table of n, a(n) for n = 1..500
EXAMPLE
73 is prime, its prime digits are (7, 3), and 2>0 so 73 is a term.
127 is prime, its prime digits are (2, 7), its nonprime digit is (1), so 127 is a term
CROSSREFS
KEYWORD
nonn,base,easy,less
AUTHOR
Juri-Stepan Gerasimov, Jan 08 2009
EXTENSIONS
Edited by Charles R Greathouse IV, Mar 25 2010
STATUS
approved