Prime Decomposition of 8th Fermat Number/Historical Note

Historical Note on Prime Decomposition of 8th Fermat Number
In $1909$, and  reported in  that they had proved that $F_8$ is not prime, but without having established what the prime factors are.

This factorisation was accomplished by and  in $1981$.

Using a Monte Carlo method, they determined the prime factors, but were unable at the time to demonstrate that the larger factor was actually prime.

They devised a mnemonic for the smaller factor:


 * I am now entirely persuaded to employ the method, a handy trick, on gigantic composite numbers.

$40$ years later, a factorisation tool freely available online, running on a machine of modest specifications, can determine the primality of the larger factor (and indeed, $F_8$ itself) practically instantaneously.