OFFSET
1,2
COMMENTS
Also numbers n such that (49*10^n+41)/9 is prime.
a(29) > 10^5. - Robert Price, Jul 21 2015
LINKS
EXAMPLE
a(n) = A101581(n) + 1.
MATHEMATICA
Do[ If[ PrimeQ[(49*10^n + 41)/9], Print[n]], {n, 0, 10000}]
CROSSREFS
KEYWORD
more,nonn
AUTHOR
Robert G. Wilson v, Jan 18 2005
EXTENSIONS
Addition of a(23) from Kamada data by Robert Price, Dec 09 2010
a(24)-a(26) from Erik Branger May 01 2013 by Ray Chandler, Aug 16 2013
a(27)-a(28) from Robert Price, Jul 21 2015
STATUS
approved