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%I #6 Jul 19 2015 01:23:21
%S 1,3,6,1,2,5,1,2,7,2,3,4,0,7,6,7,1,0,1,6,3,1,8,6,1,3,2,1,1,1,2,2,3,2,
%T 6,8,2,3,6,3,3,7,3,6,1,3,2,8,4,1,8,4,3,1,5,8,7,6,6,6,6,7,8,7,1,3,7,8,
%U 1,8,8,2,9,1,6,1,0,7,6,8,7,1,1,1,1,2,3,5,8,3,1,1,3,3,1,4,5,4,1,1,5,0,1,4,8
%N Write the natural numbers 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 7891
%C 01112
%C 131415
%C 1617181...
%t t = Flatten[IntegerDigits /@ Range[5565]]; t[[ Table[n(n + 1)/2, {n, 105}]]] (* _Robert G. Wilson v_, Feb 24 2005 *)
%Y Cf. A104606, A104607, A104608, A104609, A104610, A104611, A104612, A104613, A104614, A104615, A104616, A104617, A104618, A104619, A104620.
%K base,easy,nonn
%O 1,2
%A J. Taylor (integersfan(AT)yahoo.com), Mar 02 2004
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