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%I #10 Mar 16 2020 16:36:26
%S 0,1,2,3,4,5,6,4,5,6,7,8,9,10,5,6,7,8,9,10,11,9,10,11,12,13,14,15,7,8,
%T 9,10,11,12,13,11,12,13,14,15,16,17,12,13,14,15,16,17,18,7,8,9,10,11,
%U 12,13,11,12,13,14,15,16,17,12,13,14,15,16,17
%N Sum of digits of n in fractional base 7/4.
%C The base 7/4 expansion is unique, and thus the sum of digits function is well-defined.
%e In base 7/4 the number 7 is represented by 40 and so a(7) = 4 + 0 = 4.
%o (Sage) # uses [basepqsum from A245355]
%o [basepqsum(7,4,y) for y in [0..200]]
%Y Cf. A024641, A053828, A007953.
%K nonn,base
%O 0,3
%A _James Van Alstine_, Jul 18 2014
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