OFFSET
1,2
COMMENTS
Also numbers k such that (13*10^k + 23)/9 is prime.
a(26) > 10^5. - Robert Price, Feb 19 2015
a(26) > 2*10^5. - Tyler Busby, Feb 01 2023
LINKS
FORMULA
a(n) = A102016(n) + 1.
MATHEMATICA
Do[ If[ PrimeQ[(13*10^n + 23)/9], Print[n]], {n, 0, 10000}]
CROSSREFS
KEYWORD
more,nonn
AUTHOR
Robert G. Wilson v, Dec 16 2004
EXTENSIONS
a(24) from Erik Branger May 01 2013 by Ray Chandler, Aug 16 2013
a(25) from Robert Price, Feb 19 2015
STATUS
approved