OFFSET
1,2
COMMENTS
Also numbers k such that (19*10^k + 71)/9 is prime.
a(11) > 10^5. - Robert Price, Feb 06 2015
LINKS
FORMULA
a(n) = A101955(n) + 1.
MATHEMATICA
Do[ If[ PrimeQ[(19*10^n + 71)/9], Print[n]], {n, 0, 10000}]
CROSSREFS
KEYWORD
more,nonn
AUTHOR
Robert G. Wilson v, Dec 17 2004
EXTENSIONS
Addition of a(8)-a(10) from Kamada data by Robert Price, Dec 13 2010
STATUS
approved