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 A333023 #9 Mar 06 2020 00:57:13 %S A333023 2,100,102,498,267670,26734060,26734062,31253680,65974998,70938496, %T A333023 118428800,1232747200,2764919296,3149734998,3149735000,3413655896, %U A333023 3415058276,3755544796,4446555802,5727840798,6156991616,10080661998,10464983096,11054945296,11953158220 %N A333023 Starts of runs of 6 consecutive even numbers that are all totient numbers (A002202). %H A333023 Amiram Eldar, <a href="/A333023/b333023.txt">Table of n, a(n) for n = 1..46</a> %H A333023 Wikipedia, <a href="https://en.wikipedia.org/wiki/Euler%27s_totient_function#Totient_numbers">Totient numbers</a>. %e A333023 2 is a term since 2, 4, 6, 8, 10 and 12 are all totient numbers. %o A333023 (PARI) m = 6; v = vector(m); for(k=1, m, v[k] = istotient(2*k)); for(k = m+1, 1.5e5, if(Set(v) == [1], print1(2*(k-m),", ")); v = concat(v[2..m], istotient(2*k))) %Y A333023 Cf. A000010, A002202, A005277, A063512, A083533, A333019, A333020, A333021, A333022, A333024. %K A333023 nonn %O A333023 1,1 %A A333023 _Amiram Eldar_, Mar 05 2020