computing teh last digits without computing the number deepinlife Junior Fellow Posts: 2 Threads: 1 Joined: Feb 2009 02/23/2009, 11:48 AM guys how can i compute teh last digit of a number , resulting from tetration without computing the real number.. for example ...5||2 = 2^65536...how can i get the last digit of that number without computing it..teh last 8 digits for example ? bo198214 Administrator Posts: 1,616 Threads: 102 Joined: Aug 2007 02/23/2009, 01:21 PM deepinlife Wrote:guys how can i compute teh last digit of a number , resulting from tetration without computing the real number.. for example ...5||2 = 2^65536...how can i get the last digit of that number without computing it..teh last 8 digits for example ?See here. Where do you guys get those questions? Is it a homework exercise or so? andydude Long Time Fellow Posts: 510 Threads: 44 Joined: Aug 2007 02/24/2009, 02:32 AM bo198214 Wrote:Where do you guys get those questions? Is it a homework exercise or so? These questions are very common in contests, like the Putnam Competition. Andrew Robbins deepinlife Junior Fellow Posts: 2 Threads: 1 Joined: Feb 2009 02/24/2009, 09:09 AM it is a problem in a site : http://projecteuler.net/index.php?sectio...ems&id=214 « Next Oldest | Next Newest »

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