%I #19 Aug 11 2023 09:54:22
%S 5,5,5,5,5,10,10,15,15,20,25,30,40,50,60,75,95,120,150,185,235,290,
%T 365,455,570,710,890,1110,1390,1735,2170,2715,3390,4240,5300,6625,
%U 8280,10350,12940,16175,20215,25270,31590,39485,49355,61695,77120,96400,120500
%N Number of numbers whose base 5/4 expansion (see A024634) has n digits.
%H <a href="/index/Ba#base_fractional">Index entries for sequences related to fractional bases</a>
%F a(n) = 5*A120160(n).
%e 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.
%o (Sage)
%o A=[1]
%o for i in [1..60]:
%o A.append(ceil((5-4)/4*sum(A)))
%o [5*x for x in A]
%Y Cf. A024634, A120160, A081848.
%K nonn,base
%O 1,1
%A _James Van Alstine_, Jul 18 2014