last term

[kohmoto]

    Richard Guy wrote :
    >Perhaps no one has yet done an
    >exhaustive search as far as that?  Is this such
    >a hard job with modern technology?

    An exhaustive search has been done below 10^12.
   See Jan Pedersen's site.

    http://amicable.homepage.dk/knwnu2.htm

    >E.g. 114 has unitary divisors 1, (2,57), (3,38) and
(6,19), apart from 114 itself.  Their sum is 126, whose unitary divisors < 
126 are 1, (2,63), (7,18), (9,14) whose sum is 114.

    Thanks for the explanation of Unitary AP.



    Yasutoshi
 
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