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Search: id:A046177
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A046177 Square numbers which are also hexagonal numbers. +0
2
1, 1225, 1413721, 1631432881, 1882672131025, 2172602007770041, 2507180834294496361, 2893284510173841030625, 3338847817559778254844961, 3853027488179473932250054441, 4446390382511295358038307980025 (list; graph; listen)
OFFSET

1,2

COMMENT

Also, odd square-triangular numbers (or bisection of A001110 = {0, 1, 36, 1225, 41616, 1413721, 48024900, 1631432881, ...} = Numbers that are both triangular and square: a(n) = 34a(n-1) - a(n-2) + 2). - Alexander Adamchuk (alex(AT)kolmogorov.com), Nov 06 2007

LINKS

Eric Weisstein's World of Mathematics, Link to a section of The World of Mathematics.

Eric Weisstein, Link to a section of The World of Mathematics. Square Triangular Number.

FORMULA

a(n) = A001110(2n-1). - Alexander Adamchuk (alex(AT)kolmogorov.com), Nov 06 2007

CROSSREFS

Cf. A008844, A046176.

Cf. A001110 = Numbers that are both triangular and square: a(n) = 34a(n-1) - a(n-2) + 2.

Adjacent sequences: A046174 A046175 A046176 this_sequence A046178 A046179 A046180

Sequence in context: A025407 A025405 A014795 this_sequence A031748 A031623 A031533

KEYWORD

nonn

AUTHOR

Eric Weisstein (eric(AT)weisstein.com)

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Last modified May 17 13:02 EDT 2008. Contains 139908 sequences.


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