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A082002
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Square array read by antidiagonals, alternating upwards and downwards: T(1, 1) = 1 and every other entry is the smallest number not already used that has a common factor with every number in its row and column, not including the 1.
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7
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1, 2, 3, 6, 12, 4, 8, 18, 10, 9, 15, 24, 14, 30, 16, 20, 36, 22, 42, 40, 21, 27, 28, 48, 54, 26, 45, 32, 34, 60, 50, 66, 70, 56, 72, 33, 39, 44, 78, 84, 80, 75, 38, 51, 46, 52, 69, 68, 90, 96, 98, 102, 88, 104, 57, 63, 76, 108, 110, 114, 105, 100, 120, 92, 117, 58, 62, 87, 126
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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COMMENTS
| This is the boustrophedon method of filling an array.
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EXAMPLE
| 1, 2, 4, 8, 14, 16, ...
3, 12, 18, 24, ...
6, 10, 20, ...
9, 30, ...
15 ...
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CROSSREFS
| Cf. A082003, A082004, A082005.
Sequence in context: A065653 A102021 A144641 * A102779 A084417 A015774
Adjacent sequences: A081999 A082000 A082001 * A082003 A082004 A082005
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KEYWORD
| nonn
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AUTHOR
| Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Apr 05 2003
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EXTENSIONS
| More terms from David Wasserman (wasserma(AT)spawar.navy.mil), Jul 30 2004
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