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Search: id:A074135
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| A074135 |
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Triangle read by rows: for 1 <= k < n, a(n, k) is the least positive integer not already used. a(n, n) is the least positive integer not already used that makes the row sum a multiple of n. |
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+0
10
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| 1, 2, 4, 3, 5, 7, 6, 8, 9, 13, 10, 11, 12, 14, 18, 15, 16, 17, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 40, 36, 37, 38, 39, 41, 42, 43, 44, 49, 45, 46, 47, 48, 50, 51, 52, 53, 54, 64, 55, 56, 57, 58, 59, 60, 61, 62, 63, 65, 75, 66, 67, 68, 69, 70, 71
(list; table; graph; listen)
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OFFSET
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1,2
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COMMENT
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Alternative (but equivalent) definition: In the following square array, numbers (not occurring earlier) are entered like this a(1, 1), a(1, 2), a(2, 1), a(3, 1), a(2, 2), a(1, 3), a(1, 4), a(2, 3), a(3, 2), a(4, 1), a(5, 1), a(4, 2), ... such that the n-th diagonal sum is a multiple of n. 1 2 7 6 18... 4 5 8 14... 3 9 12... 13 11... 10... ... sequence contains terms as they are entered.
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CROSSREFS
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Cf. A074132, A074133, A074134, A074136.
Cf. A082017, A082018, A082019, A082020.
Sequence in context: A166266 A011295 A082016 this_sequence A074146 A143097 A074147
Adjacent sequences: A074132 A074133 A074134 this_sequence A074136 A074137 A074138
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KEYWORD
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nonn,easy,tabl,less
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AUTHOR
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Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Aug 27 2002
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EXTENSIONS
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Edited and extended by David Wasserman (dwasserm(AT)earthlink.net), Oct 31 2006
Further edited by N. J. A. Sloane (njas(AT)research.att.com) Jan 17 2009 at the suggestion of R. J. Mathar
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