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 A328784 #34 Sep 08 2022 08:46:24 %S A328784 2,4,5,608,1221,60264,205965,994856,69709961,3140421767 %N A328784 Integers k such that the k-th prime divides the k-th Lucas number. %p A328784 a:= 1: %p A328784 b:= 2: %p A328784 p:= 2: %p A328784 Res:= NULL: %p A328784 for n from 2 to 10^6 do %p A328784 c:= a+b; %p A328784 b:= a; %p A328784 a:= c; %p A328784 p:= nextprime(p); %p A328784 if a mod p = 0 then %p A328784 Res:= Res,n; %p A328784 fi %p A328784 od: %p A328784 Res; # _Robert Israel_, Oct 30 2019 %o A328784 (Magma) [n: n in [1..100000] | IsZero(Lucas(n) mod NthPrime(n))]; %Y A328784 Cf. A000032, A000040. %Y A328784 Cf. A075702 (analog with Fibonacci). %K A328784 nonn,more %O A328784 1,1 %A A328784 _Juri-Stepan Gerasimov_, Oct 30 2019 %E A328784 a(8) from _Robert Israel_, Oct 30 2019 %E A328784 a(9)-a(10) from _Daniel Suteu_, Nov 07 2019