OFFSET
1,3
COMMENTS
Also numbers n such that (23*10^n-17)/3 is prime.
a(20) > 10^5. - Robert Price, Oct 22 2015
LINKS
FORMULA
a(n) = A101147(n-1) + 1, for n>1.
EXAMPLE
For n=0, (23*10^n - 17)/3 = , which is prime.
MATHEMATICA
Do[ If[ PrimeQ[(23*10^n - 17)/3], Print[n]], {n, 0, 10000}]
CROSSREFS
KEYWORD
more,nonn
AUTHOR
Robert G. Wilson v, Jan 19 2005
EXTENSIONS
a(19) from Kamada data by Robert Price, Dec 14 2010
a(1)=0 inserted by Robert Price, Oct 22 2015
STATUS
approved