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Search: id:A046177
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| A046177 |
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Square numbers which are also hexagonal numbers. |
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+0
2
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| 1, 1225, 1413721, 1631432881, 1882672131025, 2172602007770041, 2507180834294496361, 2893284510173841030625, 3338847817559778254844961, 3853027488179473932250054441, 4446390382511295358038307980025
(list; graph; listen)
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OFFSET
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1,2
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COMMENT
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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
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LINKS
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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.
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FORMULA
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a(n) = A001110(2n-1). - Alexander Adamchuk (alex(AT)kolmogorov.com), Nov 06 2007
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CROSSREFS
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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
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KEYWORD
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nonn
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AUTHOR
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Eric Weisstein (eric(AT)weisstein.com)
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