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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 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.)