Isn't that more like "The last digit of any integer n⁵ is the last digit of n itself" ?
-
-
-
Yeah, tweet is not entirely correct when you consider two digit numbers and so on...
End of conversation
New conversation -
-
-
Come on! That’s no rocket science. Numbers raise to (4n + 1) x 5 will always have same number at unit’s place.
-
You're right, it's not rocket science. It's number theory. ;)
- 1 more reply
New conversation -
-
-
There are no square numbers that end in 2, 3, 7, or 8.
-
Sqrt(2,3,7,8) beg to differ lol
End of conversation
New conversation -
-
-
you can use this fact to figure out 5th roots in your head. you just need to memorise the first 9 5th powers. It's a fun trick
-
interesting
End of conversation
New conversation -
-
-
Works in some other bases too, such as base 14: 4^7 = 5d8 4 5^7 = 2068 5 6^7 = 7403 6 7^7 = 1761a 7 8^7 = 3c83a 8 69^7 = 10c0367b933c 9 6a^7 = 1202910d2a05 a 6b^7 = 1335d83279d4 b
-
Just found out that the base needs to be a squarefree number: https://oeis.org/search?q=2%2C3%2C5%2C6%2C7%2C10%2C11%2C13%2C14%2C15%2C17%2C19%2C21%2C22%2C23%2C26&language=english&go=Search …
End of conversation
New conversation -
Loading seems to be taking a while.
Twitter may be over capacity or experiencing a momentary hiccup. Try again or visit Twitter Status for more information.