OFFSET
1,1
EXAMPLE
a(5)=7^11=1977326743.
a(7)=17*19=323,
etc.
CROSSREFS
KEYWORD
nonn,less
AUTHOR
Juri-Stepan Gerasimov, Nov 08 2008
EXTENSIONS
More terms from R. J. Mathar, Apr 14 2010
STATUS
approved