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Old 2021-05-28, 17:46   #22
tuckerkao
 
"Tucker Kao"
Jan 2020
Head Base M168202123

7458 Posts
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Quote:
Originally Posted by Stargate38 View Post
If interpreted as either Base-25 or Base-30, it's prime:

M2133277 (Base-25) = 134776610807 (Base-10)
M2133277 (Base-30) = 482624813017 (Base-10)

Obviously this goes on to infinity, so I won't list anymore. However, 2^2133277-1 isn't prime: https://www.mersenne.ca/exponent/2133277
There are several Mersenne Primes end in 77 when written in the dozenal base.

[dozenal]
MӾ5,077
M507,Ӿ77
M7,046,577
[/dozenal]

All of them got a 0 and a 5 somewhere in the number.

Last fiddled with by tuckerkao on 2021-05-28 at 17:47
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