I shall choose to remember him in his prime.
"Although fifty-seven is not prime, it is jokingly known as the Grothendieck prime after a legend according to which the mathematician Alexander Grothendieck supposedly gave it as an example of a particular prime number." [1]
[1] https://en.wikipedia.org/wiki/57_(number)#In_mathematics
but the fun part is how the same happens to these four numbers -30
so 23, 29 twin with 31 then 37
my problem is that I don't know why this would be important