Possibly interesting sequence

Max Alekseyev maxale at gmail.com
Mon Aug 11 19:11:10 CEST 2008

All integers starting with 78 are good as proved by Graham:
(see also section D11 in UPINT book).

For integers below 78, it is easy to do exhaustive search to verify
whether they are good.


On Mon, Aug 11, 2008 at 7:01 AM, David Wilson <dwilson at gambitcomm.com> wrote:
> I found a puzzle site that poses in effect the following problem:
> For a set S of positive integers, call n = SUM(k in S, k) good when SUM(k in
> S, 1/k) = 1. Which integers are good?
> Fun for you programmers.

More information about the SeqFan mailing list