Didn't ready through everything but...
- finding 19 factors in 1T doublecheck
- Speed decrease by using 1k<n<50M compared to 20M<n<50M (33%??)
Basically those 19 factors per T = 57 factors per T (time wise)
That's pretty dense. Especially considering your planning on finding primes for 15k's.
Also the chances of finding the second smallest factor when you missed the first one is not great. I think we only found about 3 or 4 of these with SoB.
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