A034018 - OEIS

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A034018

Numbers that are represented by x^2+xy+y^2 but not primitively.

%I #4 Mar 30 2012 17:28:57

%S 4,9,12,16,25,27,28,36,48,52,63,64,75,76,81,84,100,108,112,117,121,

%T 124,144,148,156,171,172,175,189,192,196,208,225,228,243,244,252,256,

%U 268,279,289,292,300,304,316,324,325,333,336,351,363,364,372,387,388,400

%N Numbers that are represented by x^2+xy+y^2 but not primitively.

%Y Cf. A034017.

%K nonn

%O 1,1

%A _N. J. A. Sloane_.

%E Extended by _Ray Chandler_, Jan 29 2009