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A158937 Numbers of the form x^2+3y^2 where x and y are positive integers (with repetitions). 1

%I

%S 4,7,12,13,16,19,21,28,28,28,31,36,37,39,43,48,49,52,52,52,57,61,63,

%T 64,67,73,76,76,76,79,84,84,84,91,91,93,97,100,103,108,109,111,112,

%U 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

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

%C 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}.

%C 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

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

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

%K nonn

%O 1,1

%A _Zak Seidov_, Mar 26 2011

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Last modified July 30 04:18 EDT 2021. Contains 346348 sequences. (Running on oeis4.)