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Old 2021-05-14, 16:29   #12
Stargate38
 
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"Daniel Jackson"
May 2011
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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
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