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 A064674 #6 Jul 22 2023 08:13:09 %S A064674 0,2,2,3,6,12,23,46,94,198,424,854,1859,3884,8362,17837,38977,84188, %T A064674 183167,398685,874078 %N A064674 Number of primes q such that phiter(q)=n where phiter(n)=A064415(n). %C A064674 For n>1, a(n) is the number of primes in class n of the Phi iteration. See A003434 and A058812. [From _T. D. Noe_, Nov 05 2008] %Y A064674 Cf. A000010, A003434, A064415, A064416. %K A064674 nonn,more %O A064674 0,2 %A A064674 Christian WEINSBERG (cweinsbe(AT)fr.packardbell.org), Oct 10 2001 %E A064674 a(12)-a(16) from _T. D. Noe_, Nov 05 2008 %E A064674 a(17)-a(20) from _Sean A. Irvine_, Jul 22 2023