OFFSET
1,2
COMMENTS
Also numbers n such that (67*10^n+41)/9 is prime.
a(14) > 10^5. - Robert Price, Sep 27 2015
LINKS
FORMULA
a(n) = A101142(n) + 1.
MATHEMATICA
Do[ If[ PrimeQ[(67*10^n + 41)/9], Print[n]], {n, 0, 10000}]
CROSSREFS
KEYWORD
more,nonn
AUTHOR
Robert G. Wilson v, Jan 19 2005
EXTENSIONS
a(10)-a(11) from Kamada data by Robert Price, Dec 14 2010
a(12) from Erik Branger May 01 2013 by Ray Chandler, Aug 16 2013
a(13) from Robert Price, Sep 27 2015
STATUS
approved