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%I #13 Mar 16 2020 18:24:36
%S 0,1,2,3,4,5,6,7,8,4,5,6,7,8,9,10,11,12,8,9,10,11,12,13,14,15,16,7,8,
%T 9,10,11,12,13,14,15,11,12,13,14,15,16,17,18,19,10,11,12,13,14,15,16,
%U 17,18,14,15,16,17,18,19,20,21,22,8,9,10,11,12,13,14,15
%N Sum of digits of n written in fractional base 9/4.
%C The base 9/4 expansion is unique and thus the sum of digits function is well-defined.
%F a(n) = A007953(A024652(n)).
%e In base 9/4 the number 16 is represented by 47 and so a(16) = 4 + 7 = 11.
%o (Sage) # uses [basepqsum from A245355]
%o [basepqsum(9,4,i) for i in [0..100]]
%Y Cf. A024652, A007953, A000120, A053830, A244040.
%K nonn,base
%O 0,3
%A _Tom Edgar_, Jul 18 2014