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 A082954 #13 May 09 2022 08:37:41 %S A082954 1,3,39,111,175,183,219,333,459,471,549,579,657,831,939,969,1191,1263, %T A082954 1371,1413,1443,1623,1737,1839,1983,2019,2199,2271,2379,2493,2631, %U A082954 2817,2847,2907,2991,3279,3459,3573,3603,3639,3711,3789,3963,4113,4131,4143 %N A082954 Numbers k such that phi(k*sigma(k)) = phi(k)^2. %H A082954 Amiram Eldar, <a href="/A082954/b082954.txt">Table of n, a(n) for n = 1..10000</a> %t A082954 Select[Range[5000],EulerPhi[#*DivisorSigma[1,#]]==EulerPhi[#]^2&] (* _Harvey P. Dale_, Jan 25 2013 *) %Y A082954 Cf. A000010, A000203, A127473. %K A082954 nonn %O A082954 1,2 %A A082954 _Benoit Cloitre_, May 26 2003