cp's OEIS Frontend

A104615 Write the natural numbers in base 12 in a triangle with k digits in the k-th row, as shown below. Sequence gives the leading diagonal.

%I A104615 #2 Mar 30 2012 17:31:12
%S A104615 1,3,6,10,1,4,1,2,4,9,3,3,3,10,5,6,10,7,8,9,1,0,1,1,1,1,1,3,1,1,6,1,1,
%T A104615 8,1,1,11,2,2,3,2,2,6,2,2,10,2,3,2,3,3,6,3,3,11,4,4,3,4,4,8,4,5,2,5,5,
%U A104615 7,5,5,1,6,6,7,6,6,1,7,7,8,7,8,2,8,8,9,9,9,5,9,9,0,10,10,8,10,11,4,11,11,0
%N A104615 Write the natural numbers in base 12 in a triangle with k digits in the k-th row, as shown below. Sequence gives the leading diagonal.
%C A104615 1
%C A104615 23
%C A104615 456
%C A104615 789A
%C A104615 B1011
%C A104615 121314...
%t A104615 t = Flatten[ IntegerDigits[ Range[1900], 12]]; t[[Table[n(n + 1)/2, {n, 100}]]]
%Y A104615 Cf. A104606, A104607, A104608, A104609, A104610, A104611, A104612, A104613, A091425, A104614, A104616, A104617, A104618, A104619, A104620.
%K A104615 base,nonn
%O A104615 1,2
%A A104615 _Robert G. Wilson v_, Mar 16 2005