A245415 Number of nonnegative integers with property that their base 5/2 expansion (see A024632) has n digits.

5, 10, 25, 60, 150, 375, 940, 2350, 5875, 14685, 36715, 91785, 229465, 573660, 1434150, 3585375, 8963440, 22408600, 56021500, 140053750, 350134375, 875335935, 2188339840, 5470849600, 13677124000, 34192810000, 85482025000, 213705062500, 534262656250

Offset

1,1

Links

Table of n, a(n) for n=1..29.

Example

a(2) = 10 because  20, 21, 22, 23, 24, 40, 41, 42, 43 and 44 are the base 5/2 expansions for the integers 5, 6, 7, 8, 9, 10, 11, 12, 13 and 14 respectively and these are the only integers with 2 digits.

Prog

(Sage)
A=[1]
for i in [1..60]:
    A.append(ceil(((5-2)/2)*sum(A)))
[5*x for x in A]

Crossrefs

Cf. A081848, A245356, A024632.

Sequence in context: A025625 A112024 A362002 * A106729 A212950 A038252

Adjacent sequences: A245412 A245413 A245414 * A245416 A245417 A245418

Keyword

nonn,base

Author

Hailey R. Olafson, Jul 21 2014

Status

approved