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 A267817 #32 Dec 23 2024 14:53:44 %S A267817 1,2,4,6,8,10,12,16,18,20,24,30,32,36,40,42,48,50,54,60,64,68,72,78, %T A267817 80,84,90,96,100,108,110,114,120,126,128,136,144,150,156,160,162,168, %U A267817 180,192,200,204,210,216,220,222,228,234,240 %N A267817 Numbers m that are divisible by A268336(m). %C A267817 Squarefree terms: 1, 2, 6, 10, 30, 42, 78, 110, 114, 210, 222, ... %H A267817 Charles R Greathouse IV, <a href="/A267817/b267817.txt">Table of n, a(n) for n = 1..10000</a> %H A267817 Juri-Stepan Gerasimov, <a href="https://web.archive.org/web/*/http://list.seqfan.eu/pipermail/seqfan/2016-February/030775.html">divisors (k^k mod n) of n</a>, SeqFan list, Feb, 13, 2016 %e A267817 10 is in this sequence because 10/A268336(10) = 10/2 = 5. %o A267817 (PARI) is(n)=my(f=factor(n)[, 1],m=n); for(k=1, #f, m=lcm(m, f[k]-1)); m/=n; m && n%m==0 \\ _Charles R Greathouse IV_, Feb 22 2016 %Y A267817 Cf. A174824, A268336. %K A267817 nonn %O A267817 1,2 %A A267817 _Juri-Stepan Gerasimov_, Feb 13 2016 %E A267817 a(16) inserted by _Charles R Greathouse IV_, Feb 22 2016