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 A143422 #8 Mar 24 2023 06:31:52 %S A143422 1,2,3,2,4,1,4,5,2,3,1,7,1,1,6,5,6,2,2,1,9,1,1,2,1,5,7,1,1,11,1,8,1,4, %T A143422 4,2,13,2,1,2,1,5,1,4,2,11,1,8,1,4,1,1,2,16,1,1,4,10,2,2,1,8,1,6,1,5, %U A143422 3,1,17,1,1,5,2,3,1,2,12,3,1,6,1,1,4,1,21,1,5,9,2,1,7,1,1,3,5,5,1 %N A143422 Number of even numbers k such that phi(k) = n, where n runs through the values (A002202) taken by phi. %C A143422 All terms are positive. %H A143422 T. D. Noe, <a href="/A143422/b143422.txt">Table of n, a(n) for n=1..10000</a> %F A143422 A058277(n) = A143421(n) + a(n). %Y A143422 Cf. A207335. %K A143422 nonn %O A143422 1,2 %A A143422 _T. D. Noe_, Aug 14 2008