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<DIV><FONT face="MS UI Gothic"> Mitch </FONT></DIV>
<DIV><FONT face="MS UI Gothic"> .<BR> I saw A092788 on
your "possibly multiplicative sequences" site.</FONT></DIV>
<DIV><FONT face="MS UI Gothic"> USUP Perfect number is not
multiplicative.</FONT></DIV>
<DIV><FONT face="MS UI Gothic"><BR> UnitarySigmaUnitaryPhi(n)
or USUP(n) is a multiplicative function.<BR> The definition is
as follows.<BR> If n=Product p_i^r_i then USUP(n)=
UnitarySigma(2^r_1)*UnitaryPhi(n/2^r_1)<BR>
= (2^r_1+1)*Product(p_i^r_i-1), 2<p_i.<BR>
<BR> I will soon post it to OEIS.</FONT></DIV>
<DIV><FONT face="MS UI Gothic"></FONT> </DIV>
<DIV><FONT face="MS UI Gothic"> Neil<BR> I
found a mistake on %e line of A092760.<BR> fails :
<BR>
a(12)=2^20*4278255361*F_0*F_1*F_2*F_3*F_4<BR> correct :
<BR>
a(12)=2^40*4278255361*F_0*F_1*F_2*F_3*F_4 <BR>
the second number is a cyclotomic prime.<BR> </FONT></DIV>
<DIV><FONT face="MS UI Gothic"> The question :
: <BR> "Mathematics or food"<BR> My answer
is Mathematics. <BR> Don't
mind.<BR> God will save me.</FONT></DIV>
<DIV><FONT face="MS UI Gothic"></FONT> </DIV>
<DIV><FONT face="MS UI Gothic"> Yasutoshi</FONT></DIV>
<DIV><FONT face="MS UI Gothic"> <FONT
size=2> </FONT></DIV></FONT></BODY></HTML>