Ripley canonically had a daughter named Amanda who died while Ripley was in stasis between Alien and Aliens. Amanda Ripley is the player character in Alien: Isolation.

“What one programmer can do in one month, two programmers can do in two months.”

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There’s also the classic “no three positive integers a, b, and c to satisfy a**n + b**n = c**n for values of n greater than 2“ trick but my proof is too large to fit in this comment.

If all of the digits summed recursively reduce to a 9, then the number is divisible by 9 and also by 3.

If the difference between the sums of alternating sets digits in a number is divisible by 11, then the number itself is divisible by 11.

That’s all I can remember, but yay for math right?