A104609 - OEIS

A104609

Write the natural numbers in base 5 in a triangle with k digits in the k-th row, as shown below. Sequence gives the leading diagonal.

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

%S 1,3,0,2,2,2,1,0,1,0,1,1,3,1,2,1,2,2,4,3,3,3,4,4,3,0,0,0,4,1,2,0,1,2,

%T 2,3,2,1,3,3,2,2,1,1,4,2,0,2,2,1,4,0,4,3,3,2,3,3,4,4,2,4,2,3,4,3,4,0,

%U 1,1,0,1,0,1,1,0,1,1,1,1,1,2,1,1,1,2,4,2,1,1,2,2,3,1,1,3,1,4,1,1,4,1,4,1,2

%N Write the natural numbers in base 5 in a triangle with k digits in the k-th row, as shown below. Sequence gives the leading diagonal.

%C 1

%C 23

%C 410

%C 1112

%C 13142

%C 021222...

%t t = Flatten[IntegerDigits[Range[1500], 5]]; t[[Table[n(n + 1)/2, {n, 105}]]]

%Y Cf. A104606, A104607, A104608, A104610, A104611, A104612, A104613, A091425, A104614, A104615, A104616, A104617, A104618, A104619, A104620.

%K base,nonn

%O 1,2

%A _Robert G. Wilson v_, Mar 16 2005