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A245420 Number of nonnegative integers with property that their base 8/5 expansion (see A024647) has n digits. 0

%I #9 Jul 22 2014 22:18:42

%S 8,8,16,24,40,64,96,160,256,408,648,1040,1664,2664,4264,6816,10912,

%T 17456,27928,44688,71496,114400,183040,292864,468576,749728,1199560,

%U 1919296,3070872,4913400,7861440,12578304,20125288,32200456,51520728,82433168,131893072

%N Number of nonnegative integers with property that their base 8/5 expansion (see A024647) has n digits.

%e a(2) = 8 because 50, 51, 52, 53, 54, 55, 56, and 57 are the base 8/5 expansions for the numbers 8-15 respectively and these are the only integers with 2 digits.

%o (Sage)

%o A=[1]

%o for i in [1..100]:

%o A.append(ceil(((8-5)/5)*sum(A)))

%o [8*x for x in A]

%Y Cf. A024647, A245356, A081848.

%K nonn,base

%O 1,1

%A _Tom Edgar_, Jul 21 2014

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Last modified April 25 01:35 EDT 2024. Contains 371964 sequences. (Running on oeis4.)