OFFSET
1,3
COMMENTS
Also numbers k such that (4*10^k + 11)/3 is prime.
a(22) > 2*10^5. - Robert Price, Feb 17 2018
LINKS
FORMULA
a(n) = A102013(n-1) + 1.
MATHEMATICA
Do[ If[ PrimeQ[(4*10^n + 11)/3], Print[n]], {n, 0, 10000}]
CROSSREFS
KEYWORD
more,nonn
AUTHOR
Robert G. Wilson v, Dec 16 2004
EXTENSIONS
Addition of a(19)-a(20) from Kamada data by Robert Price, Dec 10 2010
0 added by Arkadiusz Wesolowski, Mar 10 2011
a(21) from Erik Branger May 01 2013 by Ray Chandler, Aug 16 2013
a(22)-a(24) from Tyler Busby, Apr 20 2024
STATUS
approved