Not nearly optimal, but this is a start: http://bitcoinmagazine.com/5635/primecoin-the-cryptocurrency-whose-mining-is-actually-useful/ http://bitcoinmagazine.c

Not nearly optimal, but this is a start: http://bitcoinmagazine.com/5635/primecoin-the-cryptocurrency-whose-mining-is-actually-useful/ http://bitcoinmagazine.com/5635/primecoin-the-cryptocurrency...