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 A338597 #7 Nov 07 2020 14:21:27 %S A338597 7,11,14,13,15,18,17,13,16,19,20,17,14,19,21,18,17,19,16,24,19,21,21, %T A338597 19,24,16,19,17,18,21,19,14,17,20,19,16,13,17,18,15,19,13,14,19,11,17, %U A338597 19,20,8,9,21,12,13,14,15,16,19 %N A338597 Denominators of resistance values < 1 ohm that can be obtained from a network of exactly 7 one-ohm resistors, but not from any network with fewer than 7 one-ohm resistors. Numerators are in A338580. %e A338597 The list of the 114 = A338197(7) resistance values, sorted by increasing size of R = A338580(n)/a(n) = A338607(n)/A338600(7), is the union of [1/7, 2/11, 3/14, ..., 14/15, 15/16, 18/19] and of the corresponding reciprocal resistances > 1 ohm [19/18, 16/15, 15/14, ..., 14/3, 11/2, 7]. %Y A338597 Cf. A338197, A338580, A338600, A338607. %Y A338597 Cf. A338595, A338596, A338598, A338599, A338590 (similar for n = 5..10). %K A338597 nonn,frac,fini,full %O A338597 1,1 %A A338597 _Hugo Pfoertner_, Nov 05 2020