OFFSET
1,3
COMMENTS
Also numbers n such that (86*10^n+13)/9 is prime.
a(10) > 10^5. - Robert Price, Nov 10 2015
LINKS
FORMULA
a(n) = A101011(n-1) + 1, for n>1.
MATHEMATICA
Do[ If[ PrimeQ[(86*10^n + 13)/9], Print[n]], {n, 0, 10000}]
PROG
(PARI) is(n)=isprime(9*10^n + 5*((10^n-1)/9) + 2) \\ Anders Hellström, Nov 10 2015
CROSSREFS
KEYWORD
more,nonn
AUTHOR
Robert G. Wilson v, Jan 19 2005
EXTENSIONS
a(7)-a(8) from Kamada data by Robert Price, Dec 14 2010
a(9) from Erik Branger May 01 2013 by Ray Chandler, Aug 17 2013
Inserted a(1)=0 by Robert Price, Nov 10 2015
STATUS
approved