A158937 Numbers of the form x^2+3y^2 where x and y are positive integers (with repetitions).

4, 7, 12, 13, 16, 19, 21, 28, 28, 28, 31, 36, 37, 39, 43, 48, 49, 52, 52, 52, 57, 61, 63, 64, 67, 73, 76, 76, 76, 79, 84, 84, 84, 91, 91, 93, 97, 100, 103, 108, 109, 111, 112, 112, 112, 117, 124, 124, 124, 127, 129, 133, 133, 139, 144, 147, 148, 148, 148, 151, 156, 156, 156, 157, 163, 169, 171, 172, 172, 172, 175, 181, 183, 189, 192, 193, 196, 196, 196, 196, 199, 201, 208, 208, 208, 211, 217, 217, 219, 223, 228, 228, 228, 229, 237, 241, 244, 244, 244, 247

Offset: 1

Author

Zak Seidov, Mar 26 2011

Keywords

• nonn

Comments

Least integer m with exactly n repetitions, {m,n}: {4,1},{91,2},{28,3},{196,4},{31213,5},{364,6}, {9604,7},{53599,8},{2548,9},{470596,10}.

This is an important quadratic form with a small determinant, so a list of its values with repetition is of interest. - N. J. A. Sloane, Apr 02 2011

Examples

			m=28: {x,y}={5,1},{4,2},{1,3}.
		

Crossrefs

Cf. A092572 Numbers of the form x^2+3y^2 where x and y are positive integers.