How would you precalculate a big table of the biggest prime factor of every integer in $ 2 \dots 10^K$ ?
($ K=9$ for example). The goal would be to do it once for all, save it to a file, and reload it later for fast computations. I tried with R:
library(gmp) # the fastest factorization I've found on R, faster than number theory package "numbers" v = sapply(2:10^7, function(x) as.integer(max(factorize(x)))) save(v, file="bpf.dat")
allowing later to load it with:
But this is very slow (a few minutes for $ K=7$ and seems out of reach for $ K=9$ ). How would you generate such a table faster?
Or maybe are such resources available to the community for download, computed by someone?
Note: I’ve already looked at https://oeis.org/A006530.
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