A134598 - OEIS

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A134598

Duplicate of A080773.

1, 2, 2, 2, 3, 3, 3, 4, 3, 3, 4, 3, 4, 4, 4, 2, 5, 3, 4, 5, 4, 4, 5, 4, 4, 6, 5, 4, 5, 5, 5, 5, 3, 5, 6, 3, 4, 5, 5, 3, 6, 4, 5, 6, 5, 5, 6, 6, 5, 4, 5, 4, 7, 5, 6, 5, 5, 5, 6, 5, 6, 7, 6, 5, 6, 3, 4, 6, 6, 4, 7, 3, 4, 6, 5, 6, 6, 5, 6, 8, 4, 4, 7, 4, 5, 6, 6, 4, 7, 6, 6, 7, 6, 5, 7, 3, 7, 7, 6, 4, 5, 5, 6, 7, 5

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OFFSET

2,2

LINKS

Table of n, a(n) for n=2..106.

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_2(p_k)}, where ds_2 is the digital sum base 2.

EXAMPLE

a(6)=3, since 6=2*3 and so a(6)=ds_2(2)+ds_2(3)=1+2.

CROSSREFS

Sequence in context: A259529 A196052 A080773 * A325120 A064515 A112754

Adjacent sequences: A134595 A134596 A134597 * A134599 A134600 A134601

KEYWORD

dead

AUTHOR

Hieronymus Fischer, Nov 11 2007

STATUS

approved