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