He got the joke, but was also taking it seriously as a phenomenon that could have interesting implications. This finding obviously doesn't hold base 2 (more accurately, isn't an applicable concept), and apparently becomes more pronounced in base 3.
In the other HN post there is a comment stating that it's a fairly significant occurrence in base 3 as well.
Only in bases that are itself prime ;)
It's a joke. The last digit of a binary number is parity (odd or even). Since all primes (except for the number 2 [or 10 in binary]) are odd, the last digit will of always be 1.
Yes, I am aware of that (hence 'trivially') thank you!