OFFSET
1,2
COMMENTS
Also numbers n such that (77*10^n+31)/9 is prime.
a(22) > 10^5. - Robert Price, Oct 26 2015
LINKS
FORMULA
a(n) = A101073(n) + 1.
MATHEMATICA
Do[ If[ PrimeQ[(77*10^n + 31)/9], Print[n]], {n, 0, 10000}]
CROSSREFS
KEYWORD
more,nonn
AUTHOR
Robert G. Wilson v, Jan 19 2005
EXTENSIONS
a(19) from Kamada data by Robert Price, Dec 14 2010
a(20)-a(21) from Robert Price, Oct 26 2015
STATUS
approved