Hi everybody.

Show that for some positive integer is composite iff .

Thanks.

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- April 10th 2012, 02:46 PMFernandoDivisor summatory function
Hi everybody.

Show that for some positive integer is composite iff .

Thanks. - April 10th 2012, 08:53 PMhollywoodRe: Divisor summatory function
Hi Fernando,

Try thinking about what is when is not composite (i.e. it is either prime or 1).

- Hollywood - April 11th 2012, 02:52 AMFernandoRe: Divisor summatory function
Thanks, the proof is by contradiction, is it not?

Thanks for your suggestion. - April 11th 2012, 03:18 AMprincepsRe: Divisor summatory function