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Search: id:A077581
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| A077581 |
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Triangle in which row n contains the n smallest numbers starting from 1 and coprime to n. |
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+0
8
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| 1, 1, 3, 1, 2, 4, 1, 3, 5, 7, 1, 2, 3, 4, 6, 1, 5, 7, 11, 13, 17, 1, 2, 3, 4, 5, 6, 8, 1, 3, 5, 7, 9, 11, 13, 15, 1, 2, 4, 5, 7, 8, 10, 11, 13, 1, 3, 7, 9, 11, 13, 17, 19, 21, 23, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 12, 1, 5, 7, 11, 13, 17, 19, 23, 25, 29, 31, 35, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12
(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; 1,3; 1,2,4; 1,3,5,7; 1,2,3,4,6; 1,5,7,11,13,17; 1,2,3,4,5,6,8; 1,3,5,7,9,...
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MATHEMATICA
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row[n_] := Take[Select[Range[n^2], GCD[ #, n]==1&], n]; Join@@row/@Range[13]
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CROSSREFS
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Cf. A069213, A077582.
Sequence in context: A080890 A016468 A134839 this_sequence A130419 A083110 A059016
Adjacent sequences: A077578 A077579 A077580 this_sequence A077582 A077583 A077584
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KEYWORD
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nonn,tabl,easy
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AUTHOR
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Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Nov 14 2002
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EXTENSIONS
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More terms from Sascha Kurz (sascha.kurz(AT)uni-bayreuth.de), Jan 11 2003
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