A245430 Number of nonnegative integers with property that their base 9/5 expansion (see A024653) has n digits.

9, 9, 18, 36, 63, 108, 198, 360, 648, 1161, 2088, 3762, 6768, 12186, 21933, 39483, 71064, 127917, 230256, 414459, 746028, 1342845, 2417121, 4350816, 7831476, 14096655, 25373979, 45673164, 82211688, 147981042, 266365872, 479458575, 863025435, 1553445783, 2796202404

Offset

1,1

Links

Table of n, a(n) for n=1..35.

Example

The numbers 9-17 are represented by  50, 51, 52, 53, 54, 55, 56, 57, 58 respectively in base 9/5. Since these are the only two digit integers we have a(2) = 9.

Prog

(Sage)
A=[1]
for i in [1..100]:
    A.append(ceil(((9-5)/5)*sum(A)))
[9*x for x in A]

Crossrefs

Cf. A024653, A245356, A081848.

Sequence in context: A242892 A112440 A022092 * A161365 A214831 A197497

Adjacent sequences: A245427 A245428 A245429 * A245431 A245432 A245433

Keyword

nonn,base

Author

Tom Edgar, Jul 21 2014

Status

approved