OFFSET
1,1
COMMENTS
Also numbers n such that (52*10^n-61)/9 is prime.
a(21) > 10^5. - Robert Price, Sep 05 2015
LINKS
FORMULA
a(n) = A101584(n) + 1.
MATHEMATICA
Do[ If[ PrimeQ[(52*10^n - 61)/9], Print[n]], {n, 0, 10000}]
CROSSREFS
KEYWORD
more,nonn
AUTHOR
Robert G. Wilson v, Jan 18 2005
EXTENSIONS
Addition of a(15)-a(16) from Kamada data by Robert Price, Dec 12 2010
a(17)-a(19) from Erik Branger May 01 2013 by Ray Chandler, Aug 16 2013
a(20) from Robert Price, Sep 05 2015
STATUS
approved