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Search: id:A081520
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| A081520 |
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Triangle read by rows in which row n gives n smallest numbers having common factors with n. |
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+0
3
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| 1, 1, 2, 1, 3, 6, 1, 2, 4, 6, 1, 5, 10, 15, 20, 1, 2, 3, 4, 6, 8, 1, 7, 14, 21, 28, 35, 42, 1, 2, 4, 6, 8, 10, 12, 14, 1, 3, 6, 9, 12, 15, 18, 21, 24, 1, 2, 4, 5, 6, 8, 10, 12, 14, 15, 1, 11, 22, 33, 44, 55, 66, 77, 88, 99, 110, 1, 2, 3, 4, 6, 8, 9, 10, 12, 14, 15, 16, 1, 13, 26, 39, 52, 65, 78
(list; table; graph; listen)
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OFFSET
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1,3
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EXAMPLE
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1; 1,2; 1,3,6; 1,2,4,6; 1,5,10,15,20; 1,2,3,4,6,8; 1,7,14,21,28,35,42; ...
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CROSSREFS
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Cf. A081518, A081519.
Sequence in context: A077890 A077877 A144867 this_sequence A010251 A051537 A036038
Adjacent sequences: A081517 A081518 A081519 this_sequence A081521 A081522 A081523
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KEYWORD
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nonn,tabl
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AUTHOR
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Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Mar 27 2003
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EXTENSIONS
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More terms from Ryan Propper (rpropper(AT)stanford.edu), Nov 05 2005
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