OFFSET
1,1
COMMENTS
See comments in A057900.
LINKS
Robert Israel, Table of n, a(n) for n = 1..315
EXAMPLE
a(1) = (3^4 + 4)/(4+1) = 17, a(2) = (3^6 + 6)/(6+1) = 105.
MAPLE
map(t -> (3^(t-1)+t-1)/t, select(isprime, [seq(i, i=5..100, 2)])); # Robert Israel, Nov 13 2017
CROSSREFS
KEYWORD
nonn
AUTHOR
Zak Seidov, Aug 27 2006
EXTENSIONS
Corrected and edited according to suggestion of Michel Marcus by Zak Seidov, Oct 20 2013
More terms from Robert Israel, Nov 13 2017
STATUS
approved