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A104618 Write the natural numbers in base 15 in a triangle with k digits in the k-th row, as shown below. Sequence gives the leading diagonal.

%I A104618 #2 Mar 30 2012 17:31:12
%S A104618 1,3,6,10,1,1,6,10,2,2,10,1,3,4,7,0,5,6,12,7,8,8,10,7,11,12,1,0,1,1,1,
%T A104618 1,1,3,1,1,5,1,1,8,1,1,11,1,1,14,2,2,2,2,2,5,2,2,9,2,2,13,2,3,2,3,3,6,
%U A104618 3,3,10,3,3,0,4,4,5,4,4,10,4,4,0,5,5,5,5,5,11,5,6,2,6,6,8,6,6,14,7,7,5,7,7
%N A104618 Write the natural numbers in base 15 in a triangle with k digits in the k-th row, as shown below. Sequence gives the leading diagonal.
%C A104618 1
%C A104618 23
%C A104618 456
%C A104618 789A
%C A104618 BCDE1
%C A104618 011121...
%t A104618 t = Flatten[ IntegerDigits[ Range[1900], 15]]; t[[Table[n(n + 1)/2, {n, 100}]]]
%Y A104618 Cf. A104606, A104607, A104608, A104609, A104610, A104611, A104612, A104613, A091425, A104614, A104615, A104616, A104617, A104619, A104620.
%K A104618 base,nonn
%O A104618 1,2
%A A104618 _Robert G. Wilson v_, Mar 16 2005