+1 that makes sense, and we would expect it to be much smaller than all the numbers represented by 127 bits. 3 bits can represent 8 numbers, of which half are prime (2, 3, 5, 7). 4 bits can represent 16 numbers, of which 6 (37.5%) are prime. 8 bits can represent 256 numbers, of which 57 (22.2%) are prime. It is probably unknown how many primes are in 127 bits (1.7e38 numbers), but given the trend, it's a tiny percentage .