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.

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

Offset: 1

Author

Amarnath Murthy, Apr 05 2003

Keywords

• nonn
• tabl

Comments

This is the boustrophedon method of filling an array.

Examples

			1,  2,  4,  8, 14, 16, ...
3, 12, 18, 24, ...
6, 10, 20, ...
9, 30, ...
15 ...
		

Crossrefs

Cf. A082003, A082004, A082005.

Extensions

More terms from David Wasserman, Jul 30 2004