As requested in this Pit thread, here are a few crackpot math proofs I’ve run across over the years.
To clarify, the people responsible for these websites (and/or their friends and family) have solicited a group I am associated with to comment on these. But as crackpots, they have little interest in honest critique, preferring their “discoveries” be lauded for their brilliance.
It is, by no means, a complete listing, but it does represent some of the more memorable stuff.
A simple proof of Fermat’s Last Theorem.
Yet another simple proof of Fermat’s Last Theorem.
Claim that odd perfect numbers don’t exist (actually, they might not, but this “proof” doesn’t show anything of the sort).
Proof of the twin prime conjecture.
Note that the results may be valid. Certainly, Fermat’s Last Theorem has been proven. But the “proofs” given by the cranks are definitely flawed.