25 Oct
2015
25 Oct
'15
8:05 a.m.
What HB is calling primes of form 1 + 2*p1*p2*p3... if I understand him aright, these are exactly the odd primes P such that (P-1) is squarefree. -- Warren D. Smith http://RangeVoting.org <-- add your endorsement (by clicking "endorse" as 1st step)