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Shlomi Fish committed fabeb68

Fix a bug.

h must be odd - not even.

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Files changed (2)

project-euler/138/138-analysis.txt

 a = h/2
 
 L = sqrt[ 5a^2 + 1/4 ± a ]
+
+If $a$ is whole, then L^2 will have a residue of 1/4 which means L cannot be
+whole. Therefore $h$ is odd.

project-euler/138/euler-138-1.pl

 
 use Math::BigRat lib => 'GMP';
 
-my $h = 2;
+my $h = 1;
 
 my $c2 = Math::BigRat->new('5/4');
 my $c0 = Math::BigRat->new('1/4');