%I #11 Nov 13 2017 21:57:00

%S 17,105,5369,40881,2532161,20390553,1364393897,788854912241,

%T 6641649422409,4056611764783761,296528425830656801,

%U 2544627654221217657,188573151481968108425,121907205457107043376081,79832689783834658219010233,694937020905183664168761201,461241110188546453162994653785,35255711337932980300219323747689

%N (3^p+p)/(p+1) with (p + 1) odd prime > 3.

%C See comments in A057900.

%H Robert Israel, <a href="/A121823/b121823.txt">Table of n, a(n) for n = 1..315</a>

%e a(1) = (3^4 + 4)/(4+1) = 17, a(2) = (3^6 + 6)/(6+1) = 105.

%p map(t -> (3^(t-1)+t-1)/t, select(isprime,[seq(i,i=5..100,2)])); # _Robert Israel_, Nov 13 2017

%Y Cf. A057900.

%K nonn

%O 1,1

%A _Zak Seidov_, Aug 27 2006

%E Corrected and edited according to suggestion of Michel Marcus by _Zak Seidov_, Oct 20 2013

%E More terms from _Robert Israel_, Nov 13 2017