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 A171980 #3 Mar 30 2012 17:27:05 %S A171980 5,3001,120041,532501,720241,2160721,3937501,9375001,16505501, %T A171980 120040001,158453021,165055001,202567501,289312501,562500061, %U A171980 900307501,985937501,1500512501,1512504701,3169060421,3301100021,3908604433,3993757501 %N A171980 Prime divisors of elements of A129066. %C A171980 Corresponding smallest multiples from A129066 are given in A171981. %C A171980 Prime p>5 is in this sequence if the multiplicative order of (sqrt(5)-3)/2 modulo p is the product of smaller terms of this sequence. %H A171980 Max Alekseyev, <a href="/A171980/b171980.txt">Table of n, a(n) for n = 1..25</a> (complete up to 10^10) %Y A171980 Cf. A057719, A066364, A129729, A171981 %K A171980 nonn %O A171980 1,1 %A A171980 _Max Alekseyev_, Jan 20 2010