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 A354106 #16 May 24 2022 16:31:33 %S A354106 1,24,2475,2520,2728,5347,6683,8184,8307,8568,9108,9306,10106,11484, %T A354106 12974,16041,17892,20049,23265,25265,26199,30318,32256,32435,38922, %U A354106 39618,40918,44010,44576,44872,50976,55224,55720,56516,58817,63720,63952,64890,65689,66528,67356,69860,72072,73409,74448,75795,79101,83160 %N A354106 Numbers k for which A354102(k) = A354102(sigma(k)). %C A354106 No common terms with A006872 in range a(2) .. a(1001). %C A354106 Among the 1001 initial terms, only 3119744 and 13890816 occur also in A191217. %H A354106 Antti Karttunen, <a href="/A354106/b354106.txt">Table of n, a(n) for n = 1..1001</a> %H A354106 <a href="/index/O#opnseqs">Index entries for sequences where odd perfect numbers must occur, if they exist at all</a> %H A354106 <a href="/index/Si#SIGMAN">Index entries for sequences related to sigma(n)</a> %o A354106 (PARI) %o A354106 \\ Needs also the program from A267099: %o A354106 A354102(n) = eulerphi(A267099(n)); %o A354106 isA354106(k) = (A354102(k)==A354102(sigma(k))); %Y A354106 Cf. A000010, A000203, A354102. %Y A354106 Cf. also A006872, A191217, A354189, A354362. %K A354106 nonn %O A354106 1,2 %A A354106 _Antti Karttunen_, May 18 2022