A081964 - OEIS

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.

%I #9 Jun 05 2015 05:22:56

%S 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,

%T 26,27,21,33,35,37,39,41,43,45,28,32,34,38,40,44,46,47,49,51,53,57,59,

%U 61,63,67,69,71,73,30,36,42,48,50,52,54,56,58,60,62,55,65,77,79,83,85

%N 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.

%H Paul Tek, <a href="/A081964/b081964.txt">Table of n, a(n) for n = 1..10000</a>

%H Paul Tek, <a href="/A081964/a081964.pl.txt">Perl program for this sequence</a>

%e Triangle begins:

%e 1

%e 3 5

%e 2 4 7

%e 9 11 13 15

%e 6 8 12 14 16

%e ...

%o (Perl) See Link section.

%Y Cf. A081965, A081966.

%Y Cf. A095167 (noncoprime instead of coprime).

%K nonn,tabl

%O 1,2

%A _Amarnath Murthy_, Apr 03 2003

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