

A245321


Sum of digits of n written in fractional base 6/5.


1



0, 1, 2, 3, 4, 5, 5, 6, 7, 8, 9, 10, 9, 10, 11, 12, 13, 14, 12, 13, 14, 15, 16, 17, 14, 15, 16, 17, 18, 19, 15, 16, 17, 18, 19, 20, 15, 16, 17, 18, 19, 20, 20, 21, 22, 23, 24, 25, 19, 20, 21, 22, 23, 24, 23, 24, 25, 26, 27, 28, 21, 22, 23, 24, 25, 26, 24, 25
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OFFSET

0,3


COMMENTS

The base 6/5 expansion is unique and thus the sum of digits function is welldefined.


LINKS

G. C. Greubel, Table of n, a(n) for n = 0..1000


FORMULA

a(n) = A007953(A024638(n)).


EXAMPLE

In base 6/5 the number 15 is represented by 543 and so a(15) = 5 + 4 + 3 = 12.


MAPLE

a:= proc(n) `if`(n<1, 0, irem(n, 6, 'q')+a(5*q)) end:
seq(a(n), n=0..100); # Alois P. Heinz, Aug 19 2019


MATHEMATICA

a[n_]:= a[n] = If[n==0, 0, a[5*Floor[n/6]] + Mod[n, 6]]; Table[a[n], {n, 0, 70}] (* G. C. Greubel, Aug 19 2019 *)


PROG

(Sage)
def basepqsum(p, q, n):
....L=[n]
....i=1
....while L[i1]>=p:
........x=L[i1]
........L[i1]=x.mod(p)
........L.append(q*floor(x/p))
........i+=1
....return sum(L)
[basepqsum(6, 5, i) for i in [0..70]]


CROSSREFS

Cf. A000120, A007953, A024638, A053827, A244040.
Sequence in context: A247973 A195181 A003005 * A006163 A053757 A256562
Adjacent sequences: A245318 A245319 A245320 * A245322 A245323 A245324


KEYWORD

nonn,base


AUTHOR

Tom Edgar, Jul 18 2014


STATUS

approved



