cp's OEIS Frontend

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

%I A077159 #8 May 08 2025 22:55:35
%S A077159 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,
%T A077159 26,27,21,33,35,37,39,41,43,45,28,32,34,38,40,44,46,47,49,51,53,57,59,
%U A077159 61,63,67,69,71,73,30,36,42,48,50,52,54,56,58,60,62,55,65,77,79,83,85
%N A077159 Triangle in which n-th row contains smallest n numbers coprime to n which have not occurred earlier, with a(1)=2.
%C A077159 A permutation of the natural numbers.
%C A077159 A081964 is a better version of this sequence. - _Sean A. Irvine_, May 08 2025
%e A077159 Triangle begins:
%e A077159 2
%e A077159 1 3
%e A077159 4 5 7
%e A077159 9 11 13 15
%e A077159 6 8 12 14 16
%e A077159 17 19 23 25 29 31
%e A077159 10 18 20 22 23 24 26
%e A077159 ...
%Y A077159 Cf. A077160, A077161, A077162, A081964.
%K A077159 easy,nonn,tabl
%O A077159 1,1
%A A077159 _Amarnath Murthy_, Oct 31 2002
%E A077159 More terms from Antonio G. Astudillo (afg_astudillo(AT)lycos.com), Apr 20 2003