OFFSET
1,1
COMMENTS
The exponents n are listed in A090669, cf. formula. [From M. F. Hasler, Nov 26 2009]
The next term (a(11)) has 83 digits. - Harvey P. Dale, Nov 14 2014
FORMULA
a(n)=7^A090669(n)-2. [From M. F. Hasler, Nov 26 2009]
MATHEMATICA
Select[7^Range[90]-2, PrimeQ] (* Harvey P. Dale, Nov 14 2014 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Arnaud Vernier, May 23 2004
EXTENSIONS
Terms beyond a(6) from M. F. Hasler, Nov 26 2009
STATUS
approved