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A158527 Sum of squares of consecutive positive noncubes. 1
139, 5997, 78414, 553810, 2677065, 10009839, 31098172, 84004164, 203427495, 451263505, 931565514, 1811000022, 3346004389, 5917977555, 10077955320, 16602342664, 26561396547, 41402273589, 63048577990, 94018466010 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..20.

FORMULA

a(n)=(1/2)*n*(1 + n)*(1 + 9*n + 27*n^2 + 42*n^3 + 36*n^4 + 18*n^5 + 6*n^6)

EXAMPLE

a(1)=139=2^2+...+7^2, a(2)=9^2+...+26^2.

CROSSREFS

Cf. A048396 Sum of consecutive noncubes.

Sequence in context: A217724 A230693 A223163 * A201174 A281249 A302089

Adjacent sequences:  A158524 A158525 A158526 * A158528 A158529 A158530

KEYWORD

nonn

AUTHOR

Zak Seidov, Mar 20 2009

STATUS

approved

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Last modified April 20 08:36 EDT 2019. Contains 322306 sequences. (Running on oeis4.)