Alain SMEJKAL on Sun, 26 Jun 2005 11:02:45 +0200


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strange contfrac behavior 

Dear list,

I cannot make sense of these tests (Version 2.2.11 (development)),
especially the first one :

? F7=2^2^7+1;

? \p140
   realprecision = 144 significant digits (140 digits displayed)
? contfrac(2*sqrt(F7))
  *** contfrac: impossible assignment I-->I
? contfrac(2*sqrtn(F7,2))
%7 = [36893488147419103232, 18446744073709551616, 73786976294838206464,
18446744165335521052, 2, 4]

? \p150
   realprecision = 154 significant digits (150 digits displayed)
? contfrac(2*sqrt(F7))
  *** contfrac: impossible assignment I-->I
? contfrac(2*sqrtn(F7,2))
  *** contfrac: impossible assignment I-->I

? \p160
   realprecision = 163 significant digits (160 digits displayed)
? contfrac(2*sqrt(F7))
%2 = [36893488147419103232, 18446744073709551616, 73786976294838206464,
18446744073709551616]
? contfrac(2*sqrtn(F7,2))
%3 = [36893488147419103232, 18446744073709551616, 73786976294838206464,
18446744073709551616]


Regards,

Alain.