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 A081702 #9 Jun 24 2019 09:21:45 %S A081702 17,17,19,29,31,41,67,73,73,61,41,97,103,89,37,31,101,241,73,233,61, %T A081702 109,101,113,109,397,409,67,211,137,163,181,271,421,61,197,271,199, %U A081702 433,73,151,61,577,271,307,37,163,211,631,541,113,353,199,331,461,101,97 %N A081702 Largest prime factor of the n-th Carmichael number (A002997). %H A081702 Amiram Eldar, <a href="/A081702/b081702.txt">Table of n, a(n) for n = 1..10000</a> %F A081702 a(n) = A006530(A002997(n)). - _Amiram Eldar_, Jun 24 2019 %t A081702 CarmichaelQ[n_] := Not[PrimeQ[n]] && Divisible[n - 1, CarmichaelLambda[n]]; FactorInteger[#][[-1, 1]]& /@ Select[Range[4, 10^7], CarmichaelQ] (* _Amiram Eldar_, Jun 24 2019 after _Jean-François Alcover_ at A141710 *) %Y A081702 Cf. A002997, A006530. %K A081702 nonn %O A081702 1,1 %A A081702 _Lekraj Beedassy_, Apr 02 2003