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%I #2 Mar 30 2012 17:31:12
%S 1,3,6,10,1,1,8,1,2,3,5,0,4,5,10,7,7,8,1,0,1,0,1,1,2,1,1,5,1,1,8,1,1,
%T 0,2,2,3,2,2,6,2,2,10,3,3,3,3,3,8,3,4,1,4,4,6,4,4,0,5,5,6,5,5,1,6,6,7,
%U 6,7,2,7,7,8,8,8,4,8,8,0,9,9,8,9,10,4,10,10,2,1,5,0,0,0,1,9,0,1,0,2,2,7,1
%N Write the natural numbers in base 11 in a triangle with k digits in the k-th row, as shown below. Sequence gives the leading diagonal.
%C 1
%C 23
%C 456
%C 789A
%C 10111
%C 213141
%C 5161718...
%t t = Flatten[ IntegerDigits[ Range[1850], 11]]; t[[Table[n(n + 1)/2, {n, 105}]]]
%Y Cf. A104606, A104607, A104608, A104609, A104610, A104611, A104612, A104613, A091425, A104615, A104616, A104617, A104618, A104619, A104620.
%K base,nonn
%O 1,2
%A _Robert G. Wilson v_, Mar 16 2005
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