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Old 2021-05-14, 17:54   #13
kriesel
 
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Mar 2017
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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)
Hmm. I get something quite different.
2133277 (Base 25) = 499,267,057 (base ten), which is prime per https://www.alpertron.com.ar/ECM.HTM;
2133277 (Base 30) = 1,484,813,017 (base ten) which is divisible by 61, so the corresponding Mersenne number is composite also, divisible by M61.
(base conversions performed with https://calculator.name/base-conversion.php; confirmed with https://www.rapidtables.com/convert/...converter.html)
The corresponding Mersenne numbers would have ~150,000,000 and ~447,000,000 decimal digits, respectively, not 12.
M499267057 has no factor below 273 greater than 1.

Last fiddled with by kriesel on 2021-05-14 at 17:55
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