computing teh last digits without computing the number
#1
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 ?
Reply
#2
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? Wink
Reply
#3
bo198214 Wrote:Where do you guys get those questions? Is it a homework exercise or so? Wink

These questions are very common in contests, like the Putnam Competition.

Andrew Robbins
Reply
#4
it is a problem in a site :
http://projecteuler.net/index.php?sectio...ems&id=214
Reply


Possibly Related Threads…
Thread Author Replies Views Last Post
Question Computing Kneser's Super Logarithm, and its Analytic Continuation Catullus 2 581 07/10/2022, 04:04 AM
Last Post: Catullus
Question Computing Integer Tetrations Catullus 5 923 06/10/2022, 10:59 PM
Last Post: JmsNxn
  Brjuno number in Pari-GP Ember Edison 1 1,233 10/24/2021, 03:32 AM
Last Post: Ember Edison
  SAGE code for computing flow matrix for exp(z)-1 jaydfox 4 14,997 08/21/2009, 05:32 PM
Last Post: jaydfox
  Computing Abel function at a given center jaydfox 10 22,731 11/30/2007, 06:44 PM
Last Post: andydude
  Is this number known in other contexts? Gottfried 4 10,529 11/21/2007, 08:46 PM
Last Post: andydude
  Computing Andrew's slog solution jaydfox 16 33,218 09/20/2007, 03:53 AM
Last Post: andydude



Users browsing this thread: 1 Guest(s)