It's a word-play off three concepts. The First is the famous filter for finding primes, the Sieve of Eratosthenes. Sieve of Eratosthenes

Then there is the concept of "Interesting Numbers" http://en.wikipedia.org/wiki/Interesting_number_paradox (every number is interesting).

Finally RiderOfGiraffes' nickname, since they've demonstrated to me that once you start looking at those little commentid fields it does interesting things to my obsessive-compulsive tendencies.

Sorry so obtuse. My head's been down in code all day long. If I could post in binary it might be easier :)