[seqfan] Re: sigma(odd square) = odd square

[Zak Seidov]

 Just found:
sigma (1476326929 = 7^2*11^2*499^2) = 1891467081 = 3^2*7^2*19^2*109^2.
Next one?


>Суббота, 13 февраля 2016, 23:05 +03:00 от Zak Seidov <zakseidov at mail.ru>:
>
>
>Are 1 and 81 the only odd squares with odd square sigma:
>sigma(1)=1 and sigma(81)=121?
>-- 
>Zak  Seidov
>
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