OFFSET
1,1
LINKS
Eric W. Weisstein, Ramanujan Prime
EXAMPLE
659 is a Ramanujan's prime whose digital root is 2.
CROSSREFS
KEYWORD
nonn,base
AUTHOR
Parthasarathy Nambi, Jun 22 2009
EXTENSIONS
a(53) corrected by R. J. Mathar, Jul 08 2009
STATUS
approved