A245357 Number of numbers whose base 5/4 expansion (see A024634) has n digits.

5, 5, 5, 5, 5, 10, 10, 15, 15, 20, 25, 30, 40, 50, 60, 75, 95, 120, 150, 185, 235, 290, 365, 455, 570, 710, 890, 1110, 1390, 1735, 2170, 2715, 3390, 4240, 5300, 6625, 8280, 10350, 12940, 16175, 20215, 25270, 31590, 39485, 49355, 61695, 77120, 96400, 120500

Offset

1,1

Links

Table of n, a(n) for n=1..49.

Index entries for sequences related to fractional bases

Formula

a(n) = 5*A120160(n).

Example

The numbers 10..14 are represented by 430, 431, 432, 433, 434 respectively in base 5/4. These are the only numbers with three digits, and so a(3)=5.

Prog

(Sage)
A=[1]
for i in [1..60]:
    A.append(ceil((5-4)/4*sum(A)))
[5*x for x in A]

Crossrefs

Cf. A024634, A120160, A081848.

Sequence in context: A241154 A094636 A105247 * A001735 A245101 A246839

Adjacent sequences: A245354 A245355 A245356 * A245358 A245359 A245360

Keyword

nonn,base

Author

James Van Alstine, Jul 18 2014

Status

approved