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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.
15

%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