

A120927


a(n) = floor(semiprime(n)/n).


2



4, 3, 3, 2, 2, 2, 3, 2, 2, 2, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 3, 3, 2, 2, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 2, 2, 3, 3, 2, 3, 3, 2, 2, 2, 3, 3, 3, 2, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3
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OFFSET

1,1


COMMENTS

The ratio is an integer for n = 1, 2, 3, 11, 43, 53, ...


LINKS

Andrew Howroyd, Table of n, a(n) for n = 1..1000


FORMULA

a(n) = floor(A001358(n)/n).


EXAMPLE

a(1) = floor(4/1) = 4 because 4 is the first semiprime.
a(2) = floor(6/2) = 3 because 6 is the second semiprime.
a(3) = floor(9/3) = 3 because 9 is the third semiprime.
a(4) = floor(10/4) = 2 because 4 is the fourth semiprime.


PROG

(PARI) seq(n)={my(a=vector(n), k=1, i=0); while(k<=#a, i++; if(bigomega(i)==2, a[k]=i\k; k++)); a} \\ Andrew Howroyd, Nov 08 2019


CROSSREFS

Cf. A001358.
Sequence in context: A327869 A196274 A073871 * A241180 A117323 A016502
Adjacent sequences: A120924 A120925 A120926 * A120928 A120929 A120930


KEYWORD

easy,nonn,changed


AUTHOR

Jonathan Vos Post, Aug 18 2006


EXTENSIONS

Terms a(61) and beyond from Andrew Howroyd, Nov 08 2019


STATUS

approved



