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 A121823 (3^p+p)/(p+1) with (p + 1) odd prime > 3. 1
 17, 105, 5369, 40881, 2532161, 20390553, 1364393897, 788854912241, 6641649422409, 4056611764783761, 296528425830656801, 2544627654221217657, 188573151481968108425, 121907205457107043376081, 79832689783834658219010233, 694937020905183664168761201, 461241110188546453162994653785, 35255711337932980300219323747689 (list; graph; refs; listen; history; text; internal format)
 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 Cf. A057900. Sequence in context: A194475 A164745 A221938 * A268263 A282323 A224322 Adjacent sequences:  A121820 A121821 A121822 * A121824 A121825 A121826 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

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Last modified September 20 04:04 EDT 2020. Contains 337264 sequences. (Running on oeis4.)