OFFSET
1,2
COMMENTS
Also numbers n such that (38*10^n+61)/9 is prime.
a(6) > 10^5. - Robert Price, May 08 2015
LINKS
FORMULA
a(n) = A101722(n-1) + 1.
MATHEMATICA
Do[ If[ PrimeQ[(38*10^n + 61)/9], Print[n]], {n, 0, 10000}]
CROSSREFS
KEYWORD
more,nonn
AUTHOR
Robert G. Wilson v, Jan 17 2005
EXTENSIONS
Addition of a(5) from Kamada data by Robert Price, Dec 13 2010
STATUS
approved