intervals database

Hi, I'm a begginer on tuning subjects and I'm studying
the harmonic series, and I just found out this
curiosity;

5/3 = 1,6666666666667 and 7/6 = 1,6666666666667

so can that mean we have the same distancy in the
harmonic series from a G to E and the next G to Bb????

I couldn't figure this out... anyway;

I got a little knowladge on database, and I'm thinking
about making a big database of intervals, something
like this;

3 2 1,5 702 perfect fifth
4 3 1,333333 398 perfect fourth
etc...

But I'm thinking someone has already done this, right?
Is there anything like this available for download on
the net?

Anyway, my idea is to build an ASP page, or a kind of
system available for download, where you can enter one
parameter and get the result of the other, specially
entering a value in cents and getting the proportion
values, has this been done yet, if not, why?

Thanks everyone...
Cheers
Alex

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