OFFSET
1,1
COMMENTS
Also numbers n such that (77*10^n-41)/9 is prime.
a(7) > 10^5. - Robert Price, Oct 21 2015
It appears that all terms are divisible by 3. - Robert Price, Oct 21 2015
LINKS
FORMULA
a(n) = A101070(n) + 1.
MATHEMATICA
Do[ If[ PrimeQ[(77*10^n - 41)/9], Print[n]], {n, 0, 10000}]
PROG
(PARI) for(n=1, 1e4, if(isprime((77*10^n-41)/9), print1(n, ", "))) \\ Altug Alkan, Oct 21 2015
CROSSREFS
KEYWORD
more,nonn
AUTHOR
Robert G. Wilson v, Jan 19 2005
STATUS
approved