OFFSET
1,1
COMMENTS
Also numbers n such that (55*10^n+71)/9 is prime.
a(10) > 10^5. - Robert Price, Sep 08 2015
LINKS
FORMULA
a(n) = A101521(n) + 1.
MATHEMATICA
Do[ If[ PrimeQ[(55*10^n + 71)/9], Print[n]], {n, 0, 10000}]
CROSSREFS
KEYWORD
more,nonn
AUTHOR
Robert G. Wilson v, Jan 18 2005
EXTENSIONS
Addition of a(8)-a(9) from Kamada data by Robert Price, Dec 13 2010
STATUS
approved