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 A374189 #17 Oct 07 2024 02:04:47 %S A374189 2,10,12,18,24,26,28,34,42,44,48,50,56,58,60,66,74,76,82,88,90,92,96, %T A374189 98,106,108,112,114,120,122,124,130,138,140,146,152,154,156,162,170, %U A374189 172,176,178,184,186,188,192,194,202,204,210,216,218,220,224,226,234,236,240 %N A374189 The values of A374188, seen as an ordered set. %C A374189 k is a term if and only if there exists a positive integer a of the form 4*n - 1, such that K(a / k) != K((-1)^floor(k/2)*k / a), where K denotes the Kronecker symbol (A372728). %F A374189 All terms are even. %e A374189 34 is a term, because K(15/34) = 1, but K(-34/15) = -1. %e A374189 18 is a term, because K(19/18) = 1, but K(-18/19) = -1. %Y A374189 Cf. A374188, A372728, A374157. %K A374189 nonn %O A374189 1,1 %A A374189 _Peter Luschny_, Jul 01 2024