Minor fix: pass the `j` argument to `_lucas_factor()` from `lucas_factor(n, j, tries)`.
Minor fix: pass the `j` argument to `_lucas_factor()` from `lucas_factor(n, j, tries)`.

Example:

	say lucas_factor(122738580838512721992324860157572874494433031849, -1)

...uses the N-1 version of the Lucas-Miller factorization method. By default, the N+1 version is used.

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