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Search: id:A121489
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A121489 Diagonal of array A121490. +0
2
3, 1, 9, 17, 19, 9, 18, 17, 55, 24, 38, 36, 12, 65, 106, 129, 128, 97, 30, 100, 148, 168, 154, 100, 251, 113, 198, 249, 260, 225, 138, 356, 163, 297, 389, 433, 423, 353, 217, 9, 248, 441, 17, 80, 79, 8, 506, 297, 687, 316, 574, 17, 119, 145, 89, 784, 568, 252, 737 (list; graph; listen)
OFFSET

1,1

FORMULA

a(n) = [n^(3/2) + 1]^2 - n^3, where [ ] denotes the floor function.

EXAMPLE

a(2) = [2^(3/2) + 1]^2 - 2^3 = 9 - 8 = 1.

CROSSREFS

Sequence in context: A056843 A076806 A111568 this_sequence A118793 A160568 A157403

Adjacent sequences: A121486 A121487 A121488 this_sequence A121490 A121491 A121492

KEYWORD

nonn

AUTHOR

Clark Kimberling (ck6(AT)evansville.edu), Aug 02 2006

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.


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