A245350 - OEIS

A245350

Sum of digits of n written in fractional base 9/4.

0, 1, 2, 3, 4, 5, 6, 7, 8, 4, 5, 6, 7, 8, 9, 10, 11, 12, 8, 9, 10, 11, 12, 13, 14, 15, 16, 7, 8, 9, 10, 11, 12, 13, 14, 15, 11, 12, 13, 14, 15, 16, 17, 18, 19, 10, 11, 12, 13, 14, 15, 16, 17, 18, 14, 15, 16, 17, 18, 19, 20, 21, 22, 8, 9, 10, 11, 12, 13, 14, 15

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OFFSET

0,3

COMMENTS

The base 9/4 expansion is unique and thus the sum of digits function is well-defined.

LINKS

Table of n, a(n) for n=0..70.

FORMULA

a(n) = A007953(A024652(n)).

EXAMPLE

In base 9/4 the number 16 is represented by 47 and so a(16) = 4 + 7 = 11.

PROG