OFFSET
1,2
EXAMPLE
a(1)=1 because 7(prime)-6=1(positive odd nonprime); a(2)=25 because 31(prime)-6=25(positive odd nonprime).
CROSSREFS
KEYWORD
nonn
AUTHOR
Juri-Stepan Gerasimov, Feb 14 2010
EXTENSIONS
131 and 561 removed by R. J. Mathar, Mar 09 2010
STATUS
approved