OFFSET
0,1
EXAMPLE
a(13) = 18 as A088265(13) = 10001 and 1810001 is a prime while 110001, 210001 to 1710001 are all composite.
CROSSREFS
KEYWORD
base,nonn
AUTHOR
Amarnath Murthy, Sep 28 2003
EXTENSIONS
More terms from David Wasserman, Jul 28 2005
STATUS
approved