A374189 - OEIS

%I #17 Oct 07 2024 02:04:47

%S 2,10,12,18,24,26,28,34,42,44,48,50,56,58,60,66,74,76,82,88,90,92,96,

%T 98,106,108,112,114,120,122,124,130,138,140,146,152,154,156,162,170,

%U 172,176,178,184,186,188,192,194,202,204,210,216,218,220,224,226,234,236,240

%N The values of A374188, seen as an ordered set.

%C 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 All terms are even.

%e 34 is a term, because K(15/34) = 1, but K(-34/15) = -1.

%e 18 is a term, because K(19/18) = 1, but K(-18/19) = -1.

%Y Cf. A374188, A372728, A374157.

%K nonn

%O 1,1

%A _Peter Luschny_, Jul 01 2024