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A053768 Numbers n such that sum of the first n composite numbers is a perfect square. 1
1, 6, 21, 80, 6982, 269563, 779693, 834365, 16176645, 19770092, 41049539, 228612936, 1950787140, 2404785364, 3095996836, 5236785750, 12482382942 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..17.

CROSSREFS

Cf. A002808, A000290, A053769.

Sequence in context: A192733 A192144 A026628 * A255719 A134927 A108306

Adjacent sequences:  A053765 A053766 A053767 * A053769 A053770 A053771

KEYWORD

nonn

AUTHOR

G. L. Honaker, Jr., Mar 29 2000

EXTENSIONS

a(9)-a(15) from Donovan Johnson, Dec 04 2009

a(16)-a(17) from Donovan Johnson, Jun 09 2011

STATUS

approved

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Last modified May 29 21:28 EDT 2017. Contains 287257 sequences.