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Write the natural numbers in base 13 in a triangle with k digits in the k-th row, as shown below. Sequence gives the leading diagonal.
15

%I #2 Mar 30 2012 17:31:12

%S 1,3,6,10,1,1,7,11,2,2,0,6,4,4,1,9,6,7,10,7,9,10,1,0,1,8,4,1,10,7,1,2,

%T 0,1,10,9,1,8,8,1,9,10,2,0,2,2,7,10,2,4,8,3,4,9,3,7,0,3,0,7,4,9,4,4,8,

%U 4,4,10,7,5,2,0,5,10,9,6,8,8,6,9,10,7,0,2,7,7,10,8,4,8,8,4,9,9,7,0,9,0,7,10

%N Write the natural numbers in base 13 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 BC101

%C 112131...

%t t = Flatten[ IntegerDigits[ Range[1900], 13]]; t[[Table[n(n + 1)/2, {n, 100}]]]

%Y Cf. A104606, A104607, A104608, A104609, A104610, A104611, A104612, A104613, A091425, A104614, A104615, A104617, A104618, A104619, A104620.

%K base,nonn

%O 1,2

%A _Robert G. Wilson v_, Mar 16 2005