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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. 7
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 (list; table; graph; refs; listen; history; text; internal format)
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

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Last modified August 2 03:55 EDT 2021. Contains 346409 sequences. (Running on oeis4.)