OFFSET
1,3
COMMENTS
Also numbers n such that (35*10^n-17)/9 is prime.
a(6) > 10^5. - Robert Price, Mar 30 2015
LINKS
FORMULA
a(n) = A101846(n-1) + 1.
MATHEMATICA
Do[ If[ PrimeQ[(35*10^n - 17)/9], Print[n]], {n, 0, 10000}]
CROSSREFS
KEYWORD
more,nonn
AUTHOR
Robert G. Wilson v, Dec 17 2004
EXTENSIONS
Additional term 10176 (a PRP) from Serge Batalov, Oct 12 2008
Addition of a(5) from Kamada data by Robert Price, Dec 13 2010
STATUS
approved