A129734 - OEIS

%I #18 Jun 30 2023 04:57:40

%S 5,19,13,211,7,29,71,97,1009,11,23,331,61,53,29927,463,3571,17,401,

%T 129009091,577,1559,745181,4621,43,6217,35839,47,2002867877,5521,101,

%U 39756701,79,4057,397760329,369181,68629840493971,31,241,617671248800299,3041,14177

%N List of primitive prime divisors of the numbers 3^n-2^n (A001047) in their order of occurrence.

%C Read A001047 term-by-term, factorize each term, write down any primes not seen before.

%H Amiram Eldar, <a href="/A129734/b129734.txt">Table of n, a(n) for n = 1..1893</a>

%H Graham Everest, Shaun Stevens, Duncan Tamsett and Tom Ward, <a href="http://www.jstor.org/stable/27642221">Primes generated by recurrence sequences</a>, Amer. Math. Monthly, 114 (No. 5, 2007), 417-431.

%H K. Zsigmondy, <a href="https://doi.org/10.1007%2FBF01692444">Zur Theorie der Potenzreste</a>, Monatsh. Math., 3 (1892), 265-284.

%Y Cf. A001047, A058765, A057468; A003462, A076481, A028491, A129733; A000225, A004668, A000043, A108974.

%K nonn

%O 1,1

%A _N. J. A. Sloane_, May 13 2007

%E a(41) and a(42) switched by _Amiram Eldar_, Jun 30 2023