[seqfan] Square Friendly Number

zbi74583.boat at orange.zero.jp zbi74583.boat at orange.zero.jp
Tue Feb 4 04:44:24 CET 2014


    I asked about "Square Friendly Number" to Michel Murcus.


    He sent me the result which he computed.

    These are all k*4,k*5.
    If a term which is essentially different from 4,5 exists  then it is

    I wonder if 2^4,5^2 is the only one solution of the following

    Sigma(x^2)=Sigma(y^2), GCD(x,y)=1

    Could anyone tell me if the other term exist?


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