Can't use an undefined value as an ARRAY reference at
	/System/Library/Perl/5.8.6/Math/BigInt/Calc.pm line 899 (#1)
    (F) A value used as either a hard reference or a symbolic reference must
    be a defined value.  This helps to delurk some insidious errors.
    
Uncaught exception from user code:
	Can't use an undefined value as an ARRAY reference at /System/Library/Perl/5.8.6/Math/BigInt/Calc.pm line 899.
 at /System/Library/Perl/5.8.6/Math/BigInt/Calc.pm line 899
	Math::BigInt::Calc::_acmp('ARRAY(0x18690a0)', 'ARRAY(0x18690d0)') called at /System/Library/Perl/5.8.6/Math/BigInt/Calc.pm line 1304
	Math::BigInt::Calc::_fac('Math::BigInt::Calc', 'ARRAY(0x1868fc8)') called at /System/Library/Perl/5.8.6/Math/BigFloat.pm line 1789
	Math::BigFloat::bfac('Math::BigFloat=HASH(0x1868f5c)') called at repeat.pl line 19