Math Forum http://mathforum.org/kb List of forum topics en interesting thing I've noted... http://mathforum.org/kb/thread.jspa?messageID=7924942&tstart=0#7924942 2^3-1 = 3^2-2 = 2^2+3
2^5-1 = 6^2-5 = 5^2+6
2^13-1 = 91^2-90 = 90^2+91

I realise that]]> Nov 18, 2012 2:49:18 AM Nov 18, 2012 2:49:18 AM karpmage 0