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%I #2 Mar 30 2012 17:31:12
%S 1,3,6,10,15,2,1,1,14,3,2,2,5,12,4,4,4,13,6,7,11,6,9,9,10,7,12,13,1,0,
%T 1,10,5,1,12,8,1,1,14,1,9,7,1,4,3,1,2,2,1,3,4,2,7,9,2,14,1,2,8,12,2,5,
%U 10,3,5,11,3,8,15,3,14,6,3,7,0,4,3,13,4,2,13,4,4,0,5,9,6,5,1,15,5,12,11,6
%N Write the natural numbers in base 16 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 BCDEF
%C 101112...
%t t = Flatten[ IntegerDigits[ Range[1900], 16]]; t[[Table[n(n + 1)/2, {n, 100}]]]
%Y Cf. A104606, A104607, A104608, A104609, A104610, A104611, A104612, A104613, A091425, A104614, A104615, A104616, A104617, A104618, A104620.
%K base,nonn
%O 1,2
%A _Robert G. Wilson v_, Mar 16 2005
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