OFFSET
1,3
COMMENTS
Also numbers k such that (14*10^k + 13)/9 is prime.
a(16) > 10^5. - Robert Price, Jan 17 2015
LINKS
FORMULA
a(n) = A102020(n-1) + 1.
MATHEMATICA
Do[ If[ PrimeQ[(14*10^n + 13)/9], Print[n]], {n, 0, 10000}]
CROSSREFS
KEYWORD
more,nonn
AUTHOR
Robert G. Wilson v, Dec 16 2004
EXTENSIONS
0 added by Arkadiusz Wesolowski, Mar 10 2011
a(13) from Erik Branger May 01 2013 by Ray Chandler, Aug 16 2013
a(14)-a(15) from Robert Price, Jan 17 2015
a(16) from Kamada data by Tyler Busby, Apr 30 2024
STATUS
approved