A027923 - OEIS

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A027923

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

0

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, 16, 16, 16, 17, 17, 18, 18, 18, 19, 19, 19, 20, 20, 21, 21, 21, 22, 22, 22, 23, 23, 24, 24, 24, 25, 25, 25, 26, 26, 26, 27, 27, 27, 28, 28, 28, 29

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,2

LINKS

Table of n, a(n) for n=1..65.

FORMULA

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

CROSSREFS

Sequence in context: A119466 A100922 A047785 * A167743 A020888 A196393

Adjacent sequences: A027920 A027921 A027922 * A027924 A027925 A027926

KEYWORD

nonn

AUTHOR

Clark Kimberling

STATUS

approved