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Triangle read by rows in which the n-th row contains n smallest numbers not coprime to n; except first row = {1}.
3

%I #5 Dec 05 2013 19:55:54

%S 1,2,4,3,6,9,2,4,6,8,5,10,15,20,25,2,3,4,6,8,9,7,14,21,28,35,42,49,2,

%T 4,6,8,10,12,14,16,3,6,9,12,15,18,21,24,27,2,4,5,6,8,10,12,14,15,16,

%U 11,22,33,44,55,66,77,88,99,110,121,2,3,4,6,8,9,10,12,14,15,16,18,13,26

%N Triangle read by rows in which the n-th row contains n smallest numbers not coprime to n; except first row = {1}.

%e 1; 2,4; 3,6,9; 2,4,6,8; 5,10,15,20,25; 2,3,4,6,8,9; 7,14,21,28,35,42,49; ...

%Y Cf. A077662, A077663.

%K nonn,tabl

%O 1,2

%A _Amarnath Murthy_, Nov 14 2002

%E More terms from _Sascha Kurz_, Jan 27 2003