This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A129737 #10 Mar 03 2018 18:30:23 %S A129737 7,37,5,11,71,13,14197,337,6553,181,23,174659,193,131,500111,379,61, %T A129737 601,17,4241,17050729021,19,163,10814953,25309,8861,8352709,727,859, %U A129737 47,44483,17389,1933,51361,1440528320401,313,31357,36174709,2053,29,376853,59,349 %N A129737 List of primitive prime divisors of the numbers 4^n-3^n (A005061) in their order of occurrence. %C A129737 Read A005061 term-by-term, factorize each term, write down any primes not seen before. %H A129737 G. Everest et al., <a href="http://www.jstor.org/stable/27642221">Primes generated by recurrence sequences</a>, Amer. Math. Monthly, 114 (No. 5, 2007), 417-431. %H A129737 K. Zsigmondy, <a href="https://doi.org/10.1007%2FBF01692444">Zur Theorie der Potenzreste</a>, Monatsh. Math., 3 (1892), 265-284. %Y A129737 Cf. A005061, A129736, A059801, A129733. %K A129737 nonn %O A129737 1,1 %A A129737 _N. J. A. Sloane_, May 13 2007