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 A299213 #6 Feb 09 2018 12:55:43
%S A299213 399,935,565861139,5778659039,22824172799,49569379679,221511111527,
%T A299213 572531110799,745012846679
%N A299213 Lucas-Carmichael numbers whose prime factors do not divide any smaller Lucas-Carmichael number.
%C A299213 Also numbers whose number of occurrence in A253597 equals the number of their prime factors.
%C A299213 All known terms have only 3 prime factors. Does any term with more than 3 prime factors exist?
%e A299213 565861139 = 193*1163*2521 and no smaller Lucas-Carmichael number is divisible by 193, 1163 or 2521.
%o A299213 (PARI) a=readvec("b006972.txt"); print1(399); for(b=2,10000, e=true; f=factor(a[b]); for(d=1,#f[, 1], for(c=1,b-1, if(a[c]%f[d,1]==0, e=false))); if(e==true, print1(", ",a[b])))
%Y A299213 Cf. A006972, A202562, A253597.
%K A299213 nonn,more
%O A299213 1,1
%A A299213 _Tim Johannes Ohrtmann_, Feb 05 2018