This thread is about solving them using pen and paper: http://forum.projecteuler.net/viewtopic.php?f=50&t=1982 http://forum.projecteuler.net/viewtopic.php?f=50

This thread is about solving them using pen and paper: http://forum.projecteuler.net/viewtopic.php?f=50&t=1982 http://forum.projecteuler.net/viewtopic.php?f=50&t=1982 I don't see this problem listed, but I didn't look through the whole thread.