OFFSET
1,1
COMMENTS
a(13) > 2.5*10^5. - Robert Price, Apr 12 2015
LINKS
EXAMPLE
6 is a member because 10^6-21 = 1000000-21 = 999979, which is prime.
CROSSREFS
KEYWORD
more,nonn
AUTHOR
Julien Peter Benney (jpbenney(AT)ftml.net), Jun 30 2005
EXTENSIONS
Edited by Ray Chandler, Dec 23 2010
a(10)=53558 from Robert Price, Mar 03 2011
a(11)-a(12) from Kamada data by Robert Price, Apr 12 2015
STATUS
approved