A230109 Values of d such that the equation x^2 - d*y^2 = 3*d has integer solutions.

3, 7, 12, 13, 19, 21, 27, 28, 31, 39, 43, 48, 52, 57, 61, 63, 67, 73, 75, 76, 84, 91, 93, 97, 103, 108, 109, 111, 112, 117, 124, 127, 129, 133, 139, 147, 151, 156, 157, 163, 171, 172, 175

Offset: 1

Author

Colin Barker, Oct 09 2013

Keywords

• nonn

Examples

			43 appears in the sequence because the equation x^2 - 43*y^2 = 129 has integer solutions, such as (x,y) = (86,13).
		

Crossrefs

Cf. A172000, A230108.