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a(n) = least k such that E{1,2,...,k} >= 1^2 + 2^2 + ... + n^2, where E = 2nd elementary symmetric function.
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%I #8 Mar 30 2012 18:56:15

%S 1,2,3,3,4,5,5,6,6,7,7,8,8,9,9,10,10,11,11,12,12,13,13,13,14,14,15,15,

%T 16,16,16,17,17,18,18,18,19,19,19,20,20,21,21,21,22,22,22,23,23,24,24,

%U 24,25,25,25,26,26,26,27,27,27,28,28,28,29

%N a(n) = least k such that E{1,2,...,k} >= 1^2 + 2^2 + ... + n^2, where E = 2nd elementary symmetric function.

%F min{k: A000914(k) >= A000330(n)}. - R. J. Mathar, Oct 31 2011

%K nonn

%O 1,2

%A _Clark Kimberling_