Tuesday, September 6, 2016

Avi's Number

"... suppose we define f(X) over integers as taking the 1st digit from the left, then the 2nd, then the 4th, then the 8th, etc, so f(12345)=124 and f(12345678)=1248
Set y=f(f(f(f(f(…f(Graham’s number))))) such that there are the fewest number of fs such that y has less than a million digits." [1]

y is Avi's number.  Is Avi's number a prime or composite number?

Because we know the last digits of Graham's number, it seems to me that there might be a way to determine if the last digits of Avi's number is definitely not a prime.

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