A077159 Triangle in which n-th row contains smallest n numbers coprime to n which have not occurred earlier, with a(1)=2.

2, 1, 3, 4, 5, 7, 9, 11, 13, 15, 6, 8, 12, 14, 16, 17, 19, 23, 25, 29, 31, 10, 18, 20, 22, 24, 26, 27, 21, 33, 35, 37, 39, 41, 43, 45, 28, 32, 34, 38, 40, 44, 46, 47, 49, 51, 53, 57, 59, 61, 63, 67, 69, 71, 73, 30, 36, 42, 48, 50, 52, 54, 56, 58, 60, 62, 55, 65, 77, 79, 83, 85

Offset: 1

Author

Amarnath Murthy, Oct 31 2002

Keywords

• easy
• nonn
• tabl

Comments

A permutation of the natural numbers.

A081964 is a better version of this sequence. - Sean A. Irvine, May 08 2025

Examples

			Triangle begins:
2
1 3
4 5 7
9 11 13 15
6 8 12 14 16
17 19 23 25 29 31
10 18 20 22 23 24 26
...
		

Crossrefs

Cf. A077160, A077161, A077162, A081964.

Extensions

More terms from Antonio G. Astudillo (afg_astudillo(AT)lycos.com), Apr 20 2003