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 A377950 #7 Nov 13 2024 17:22:41
%S A377950 1,2,6,12,42,60,84,120,140,156,168,210,220,240,280,312,360,420,440,
%T A377950 462,468,504,600,630,660,720,770,780,840,924,936,1008,1064,1092,1170,
%U A377950 1200,1260,1320,1404,1428,1540,1560,1680,1683,1800,1806,1848,1860,1980,2016,2160
%N A377950 Numbers k that divide A057643(k) = lcm{d+1 : d|k}.
%C A377950 After the first term a(1) = 1, the next odd term is a(44) = 1683, the next term that is coprime to 6 is a(159) = 10465, and the next term that is coprime to 30 is a(1359) = 151487.
%H A377950 Amiram Eldar, <a href="/A377950/b377950.txt">Table of n, a(n) for n = 1..10000</a>
%t A377950 Select[Range[2500], Divisible[LCM @@ (Divisors[#] + 1), #] &]
%o A377950 (PARI) is(k) = !(lcm(apply(x->x+1, divisors(k))) % k);
%Y A377950 Cf. A057643.
%Y A377950 A377951 is a subsequence.
%Y A377950 Similar sequences: A056954, A355331, A377952.
%K A377950 nonn,easy
%O A377950 1,2
%A A377950 _Amiram Eldar_, Nov 12 2024