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A085782
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Numbers that can be written as a product of triangular numbers.
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2
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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, 216, 225, 231, 234, 243, 252, 253, 270, 273, 276, 280, 300, 315, 324, 325, 330, 351
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,3
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COMMENTS
| 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
| 54=6*3*3=t(3)*t(2)*t(2)
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CROSSREFS
| Cf. A000217.
Sequence in context: A188299 A187577 A111359 * A085780 A166047 A107084
Adjacent sequences: A085779 A085780 A085781 * A085783 A085784 A085785
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KEYWORD
| nonn
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AUTHOR
| Jon Perry (perry(AT)globalnet.co.uk), Jul 23 2003
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EXTENSIONS
| More terms from Max Alekseyev (maxale(AT)gmail.com) and Jon E. Schoenfield (jonscho(AT)hiwaay.net), Sep 04 2009
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