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 A374181 #9 Jul 01 2024 19:18:54 %S A374181 2,10,12,18,24,26,34,44,48,50,58,60,66,74,76,82,88,90,92,96,106,108, %T A374181 114,120,122,124,130,138,146,152,156,162,170,172,176,178,184,186,188, %U A374181 192,194,202,204,216,218,220,226,234,236,240,242,248,250,258,268,274 %N A374181 Numbers k such that K(7 / k) != K((-1)^floor(k/2)*k / 7), where K(a/b) is the Kronecker symbol. Row 2 of A374188. %o A374181 (SageMath) # see A374188 %o A374181 print(A374188_row(2, 350)) %Y A374181 Cf. A374188, A374180, A374182, A374183, A374184. %Y A374181 Cf. A372728 (Kronecker). %K A374181 nonn %O A374181 1,1 %A A374181 _Peter Luschny_, Jun 30 2024