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 A329528 #10 May 10 2020 06:50:37 %S A329528 1,7,39,41,225,6257,33463,33471,182157,182167,1008899,32487701 %N A329528 Numbers k such that the k-th lucky number (A000959) is divisible by k. %C A329528 The corresponding lucky numbers, A000959(a(n)) are 1, 21, 195, 205, 1575, 68827, 435019, 435123, 2732355, 2732505, 17151283, 682241721, ... %C A329528 The corresponding quotients A000959(a(n))/a(n) are 1, 3, 5, 5, 7, 11, 13, 13, 15, 15, 17, 21, ... %C A329528 a(13) > 4*10^9, if it exists. - _Giovanni Resta_, May 10 2020 %e A329528 7 is in the sequence since the 7th lucky number, 21 = 3 * 7 is divisible by 7. %Y A329528 Cf. A000959. %Y A329528 Cf. also A329529. %K A329528 nonn,more %O A329528 1,2 %A A329528 _Amiram Eldar_, Nov 15 2019