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Numbers which are simultaneously of the form x^2+y^2, x^2+2y^2, x^2+3y^2, x^2+7y^2, all with x>=0, y>=0.
9

%I #6 Sep 11 2012 11:10:41

%S 1,4,9,16,25,36,49,64,81,100,121,144,169,193,196,225,256,289,324,337,

%T 361,400,441,457,484,529,576,625,673,676,729,772,784,841,900,961,1009,

%U 1024,1033,1089,1129,1156,1201,1225,1296,1297,1348,1369,1444,1521,1600,1681,1737,1764,1801,1828,1849,1873,1936,2017

%N Numbers which are simultaneously of the form x^2+y^2, x^2+2y^2, x^2+3y^2, x^2+7y^2, all with x>=0, y>=0.

%Y Union of A216451 and the squares (A000290).

%K nonn

%O 1,2

%A _V. Raman_, Sep 07 2012

%E Edited by _N. J. A. Sloane_, Sep 11 2012