A081966 -id:A081966 - cp's OEIS frontend

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

Amarnath Murthy, Apr 03 2003

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

Paul Tek, Table of n, a(n) for n = 1..10000
Paul Tek, Perl program for this sequence

Cf. A081965, A081966.

Cf. A095167 (noncoprime instead of coprime).

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

A081965 Diagonal of A081964.

Original entry on oeis.org

1, 5, 7, 15, 16, 31, 27, 45, 49, 73, 62, 103, 86, 129, 133, 163, 146, 217, 178, 251, 248, 293, 262, 359, 316, 399, 386, 461, 418, 569, 472, 585, 580, 657, 634, 761, 675, 813, 796, 911, 830, 1039, 908, 1083, 1072, 1171, 1088, 1313, 1192, 1399, 1334, 1489

Offset: 1

Amarnath Murthy, Apr 03 2003

nonn

Cf. A081964, A081966.

a(n)=A077161(n), n>2. [From R. J. Mathar, Dec 15 2008]

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

cp's OEIS Frontend

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.

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