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 A140409 #6 Nov 07 2016 12:50:08 %S A140409 2,3,7,11,19,23,29,31,41,43,47,59,67,71,79,83,101,103,107,127,131,139, %T A140409 151,163,167,179,181,191,199,211,223,227,229,239,241,251,263,271,281, %U A140409 283,307,311,331,347,349,359,367,379,383,401,409,419,431,439,443,449 %N A140409 Prime factors of Lucas numbers. %C A140409 a(n) is A096362(n) in ascending order. %H A140409 C. Smyth, <a href="https://cs.uwaterloo.ca/journals/JIS/VOL13/Smyth/smyth2.html">The terms in Lucas Sequences divisible by their indices</a>, JIS 13 (2010) #10.2.4. %F A140409 Union of 2, A053027 and A053032 - _T. D. Noe_, Jun 21 2008 %Y A140409 Cf. A096362 Order in which prime factors first occur in the Lucas sequence. %K A140409 nonn %O A140409 1,1 %A A140409 _Tanya Khovanova_, Jun 16 2008 %E A140409 More terms from _T. D. Noe_, Jun 21 2008