OFFSET
1,2
EXAMPLE
a(1)=1 because 11(prime)-10=1(positive odd nonprime); a(2)=9 because 19(prime)-10=9(positive odd nonprime).
CROSSREFS
KEYWORD
nonn
AUTHOR
Juri-Stepan Gerasimov, Feb 14 2010
EXTENSIONS
343 inserted by R. J. Mathar, Feb 21 2010
STATUS
approved