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+--- Thread: computing teh last digits without computing the number (/showthread.php?tid=242)
computing teh last digits without computing the number - deepinlife - 02/23/2009
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 ?
RE: computing teh last digits without computing the number - bo198214 - 02/23/2009
deepinlife Wrote:guys how can i compute teh last digit of a number , resulting from tetration without computing the real number..See here.
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 ?
Where do you guys get those questions? Is it a homework exercise or so?
RE: computing teh last digits without computing the number - andydude - 02/24/2009
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
RE: computing teh last digits without computing the number - deepinlife - 02/24/2009
it is a problem in a site :
http://projecteuler.net/index.php?section=problems&id=214