Follow up on twin primes-
FROM WIKIPEDIA:On April 17, 2013, Yitang Zhang announced a proof that
for some integer N that is at most 70 million, there
are infinitely many pairs of primes that differ by N.[1][2]
Zhang's paper was accepted by Annals of Mathematics
in early May 2013.[3]Terence Tao subsequently proposed a
Polymath
project collaborative effort to optimize Zhang’s bound;[4]
as of November 28, 2013, Thomas Engelsma claims to have
reduced the bound to N = 576.[5]
Counting activity: How many pencils? How many Leprechauns?
