OFFSET
1,2
COMMENTS
Also numbers n such that (49*10^n-13)/9 is prime.
a(14) > 10^5. - Robert Price, Jul 16 2015
LINKS
FORMULA
a(n) = A101579(n) + 1.
MATHEMATICA
Do[ If[ PrimeQ[(49*10^n - 13)/9], Print[n]], {n, 0, 10000}]
CROSSREFS
KEYWORD
more,nonn
AUTHOR
Robert G. Wilson v, Jan 18 2005
EXTENSIONS
a(13) from Robert Price, Jul 16 2015
STATUS
approved