id:A082002 - OEIS Search Results

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A082002

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.

+0
18

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; listen)

	OFFSET	`1,2`
	COMMENT	`This is the boustrophedon method of filling an array.`
	EXAMPLE	`1 2 4 8 14 16 ...` `3 12 18 24 ...` `6 10 20 ...` `9 30 ...` `15 ...`
	CROSSREFS	`Cf. A082003, A082004, A082005.` `Adjacent sequences: A081999 A082000 A082001 this_sequence A082003 A082004 A082005` `Sequence in context: A102952 A065653 A102021 this_sequence A102779 A084417 A015774`
	KEYWORD	`nonn`
	AUTHOR	`Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Apr 05 2003`
	EXTENSIONS	`More terms from David Wasserman (wasserma(AT)spawar.navy.mil), Jul 30 2004`

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Last modified October 11 13:47 EDT 2008. Contains 144830 sequences.

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