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A134599 Sum of digital sums (base 3) of the prime factors of n. 19
2, 1, 4, 3, 3, 3, 6, 2, 5, 3, 5, 3, 5, 4, 8, 5, 4, 3, 7, 4, 5, 5, 7, 6, 5, 3, 7, 3, 6, 3, 10, 4, 7, 6, 6, 3, 5, 4, 9, 5, 6, 5, 7, 5, 7, 5, 9, 6, 8, 6, 7, 7, 5, 6, 9, 4, 5, 5, 8, 5, 5, 5, 12, 6, 6, 5, 9, 6, 8, 7, 8, 5, 5, 7, 7, 6, 6, 7, 11, 4, 7, 3, 8, 8, 7, 4, 9, 5, 7, 6, 9, 4, 7, 6, 11, 5, 8, 5, 10, 5, 8, 5, 9, 7 (list; graph; refs; listen; history; text; internal format)
OFFSET

2,1

LINKS

Table of n, a(n) for n=2..105.

FORMULA

If p_1*p_2*p_3* ... *p_m=n is the unique prime factorization of n, then a(n)=sum{1<=k<=m, ds_3(p_k)}, where ds_3 is the digital sum base 3.

EXAMPLE

a(6)=3, since 6=2*3 and so a(6)=ds_3(2)+ds_3(3)=2+1.

CROSSREFS

Cf. A007953, A118503, A080773.

Sequence in context: A304573 A094322 A136757 * A117235 A159573 A102916

Adjacent sequences:  A134596 A134597 A134598 * A134600 A134601 A134602

KEYWORD

nonn,base

AUTHOR

Hieronymus Fischer, Nov 11 2007

STATUS

approved

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Last modified September 17 08:31 EDT 2019. Contains 327127 sequences. (Running on oeis4.)