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 A383890 #12 May 22 2025 09:11:41 %S A383890 1,2,7,30,85,257,1031,2493,3288,7604,13392,22663,26818,31377,110175, %T A383890 186971,400432,890621,1536566,17176199,27501485,102834105,173246634, %U A383890 182261294,214104745,268935021,1781734397,4010389565,6213586719 %N A383890 Index of record gaps between totient numbers. %C A383890 Values of k such that A002202(k+1) - A002202(k) > A002202(i+1) - A002202(i) for all i<k. The gaps are in A383889. %e A383890 A002202(8)-A002202(7) = 4, which is greater than A002202(i+i)-A002202(i) for all i<7, so 7 is in the sequence. %Y A383890 Cf. A000010, A002202, A083533, A383889. %K A383890 nonn,more %O A383890 1,2 %A A383890 _Jud McCranie_, May 13 2025