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 A202562 #21 Feb 16 2025 08:33:16 %S A202562 561,84350561,851703301,2436691321,34138047673,60246018673, %T A202562 63280622521,83946864769,110296864801,114919915021,155999871721, %U A202562 225593397919,342267565249,534919693681,660950414671,733547013841,1079942171239,1301203515361,1333189866793 %N A202562 Carmichael numbers whose prime factors do not divide any smaller Carmichael number. %C A202562 Note that all terms so far have only three prime factors. %H A202562 Amiram Eldar, <a href="/A202562/b202562.txt">Table of n, a(n) for n = 1..10000</a> (calculated using data from Claude Goutier; terms 1..1377, terms below 10^18, from Donovan Johnson) %H A202562 Claude Goutier, <a href="http://www-labs.iro.umontreal.ca/~goutier/OEIS/A055553/">Compressed text file carm10e22.gz containing all the Carmichael numbers up to 10^22</a>. %H A202562 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/CarmichaelNumber.html">Carmichael Number</a>. %H A202562 <a href="/index/Ca#Carmichael">Index entries for sequences related to Carmichael numbers</a>. %e A202562 a(2) = 84350561 because 84350561 = 107*743*1061 and the smaller Carmichael numbers do not have the factors 107, 743 or 1061. %Y A202562 Cf. A002997, A087788. %K A202562 nonn %O A202562 1,1 %A A202562 _Arkadiusz Wesolowski_, Dec 21 2011