OFFSET
1,2
COMMENTS
Also numbers n such that (32*10^n+31)/9 is prime.
a(19) > 10^5. - Robert Price, May 31 2015
LINKS
FORMULA
a(n) = A101838(n-1) + 1.
MATHEMATICA
Do[ If[ PrimeQ[(32*10^n+31)/9], Print[n]], {n, 0, 10000}]
CROSSREFS
KEYWORD
more,nonn
AUTHOR
Robert G. Wilson v, Dec 17 2004
EXTENSIONS
Addition of a(17) from Kamada data by Robert Price, Dec 12 2010
a(18) from Robert Price, May 31 2015
STATUS
approved