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.
Zhang's paper was accepted by Annals of Mathematics
in early May 2013.Terence Tao subsequently proposed a
project collaborative effort to optimize Zhang’s bound;
as of November 28, 2013, Thomas Engelsma claims to have
reduced the bound to N = 576.
Counting activity: How many pencils? How many Leprechauns?