bug fix: seed * q -> seed * q + i

[st3inum]

If we use pos = seed * q, it will generate same number of each test case.

[maspypy]

Thank you!
Can you do ./generate.py math/factorize/info.toml --dev and commit hash.json?

[hos-lyric]

In fact we have fixed the bug in #672; the generator with _bug in its name is there in order to keep the test cases (which might happen to be useful). Sorry for confusion.