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 A066696 #26 Dec 26 2024 13:22:55
%S A066696 1247,1421,2059,2494,2842,3053,3479,3683,4118,4859,5537,6106,6119,
%T A066696 6931,6958,7366,8023,8471,9017,9653,9718,9947,10277,10991,11074,11711,
%U A066696 12083,12238,13427,13769,13862,13987,14239,14351,15863,16046,16942
%N A066696 Numbers k such that Euler phi(k) / Carmichael lambda(k) = 14.
%H A066696 Amiram Eldar, <a href="/A066696/b066696.txt">Table of n, a(n) for n = 1..10000</a>
%o A066696 (PARI) {cmf(f)=if( ((f[1]==2)&&(f[2]>2)),eulerphi(f[1]^f[2])/2, eulerphi(f[1]^f[2])) }
%o A066696 {cl(f)= my(k=factor(f), l=1); for(x=1,omega(f),l=lcm(l,cmf([k[x,1], k[x,2]]))); l }
%o A066696 {A062377(n)=eulerphi(n)/cl(n)}
%o A066696 for(x=1,30001, if(A062377(x)==14,print1(x,",")))
%o A066696 (PARI) isok(k) = eulerphi(k)/lcm(znstar(k)[2]) == 14; \\ _Michel Marcus_, May 25 2022
%Y A066696 Cf. A000010, A002322.
%Y A066696 Cf. A062373, A062374, A062375, A062376, A062377.
%K A066696 easy,nonn
%O A066696 1,1
%A A066696 _Randall L Rathbun_, Jan 12 2002
%E A066696 Terms joined (twice) by _Georg Fischer_, Jul 08 2022