%I #2 Mar 30 2012 17:31:12
%S 1,3,6,10,0,3,1,1,1,6,2,3,10,3,4,5,13,8,7,8,10,7,10,11,1,0,1,0,1,1,2,
%T 1,1,5,1,1,7,1,1,10,1,1,13,2,2,2,2,2,6,2,2,9,2,2,13,3,3,3,3,3,8,3,3,
%U 12,4,4,3,4,4,8,4,4,13,5,5,4,5,5,10,5,6,2,6,6,8,6,6,0,7,7,6,7,7,13,8,8,6,8,8
%N Write the natural numbers in base 14 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 BCD10
%C 111213...
%t t = Flatten[ IntegerDigits[ Range[1900], 14]]; t[[Table[n(n + 1)/2, {n, 100}]]]
%Y Cf. A104606, A104607, A104608, A104609, A104610, A104611, A104612, A104613, A091425, A104614, A104615, A104616, A104618, A104619, A104620.
%K base,nonn
%O 1,2
%A _Robert G. Wilson v_, Mar 16 2005