A081964 In the following triangle the n-th row contains n numbers relatively prime to n and not occurring in a previous row. a(1) = 1. Sequence contains the triangle by rows.

1, 3, 5, 2, 4, 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

1,2

Links

Paul Tek, Table of n, a(n) for n = 1..10000

Paul Tek, Perl program for this sequence

Example

Triangle begins:
1
3 5
2 4 7
9 11 13 15
6 8 12 14 16
...

Prog

(Perl) See Link section.

Crossrefs

Cf. A081965, A081966.

Cf. A095167 (noncoprime instead of coprime).

Sequence in context: A210521 A219249 A203553 * A082817 A084753 A163364

Adjacent sequences: A081961 A081962 A081963 * A081965 A081966 A081967

Keyword

nonn,tabl

Author

Amarnath Murthy, Apr 03 2003

Extensions

More terms from Antonio G. Astudillo (afg_astudillo(AT)lycos.com), Apr 08 2003

Status

approved