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Search: id:A085782
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| A085782 |
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Numbers that can be written as a product of triangular numbers. |
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+0
3
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| 0, 1, 3, 6, 9, 10, 15, 18, 21, 27, 28, 30, 36, 45, 54, 55, 60, 63, 66, 78, 81, 84, 90, 91, 100, 105, 108, 120, 126, 135, 136, 150, 153, 162, 165, 168, 171, 180, 189, 190, 198, 210
(list; graph; listen)
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OFFSET
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1,3
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COMMENT
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These are the numbers that appear at least once in A007425 (the number of ordered factorizations of n as n = rst). - Matthew Vandermast (ghodges14(AT)comcast.net), Jul 26 2003
Contains A085780 as a subsequence (exactly 2 factors); 27,54,81,... are the first elements in the complement. - M. F. Hasler (www.univ-ag.fr/~mhasler), Apr 03 2008
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EXAMPLE
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54=6*3*3=t(3)*t(2)*t(2)
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CROSSREFS
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Cf. A000217.
Sequence in context: A113502 A061904 A111359 this_sequence A085780 A107084 A065940
Adjacent sequences: A085779 A085780 A085781 this_sequence A085783 A085784 A085785
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KEYWORD
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nonn,more
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AUTHOR
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Jon Perry (perry(AT)globalnet.co.uk), Jul 23 2003
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