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Old 2020-06-28, 14:34   #4
kriesel
 
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Mar 2017
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https://www.alpertron.com.ar/ECM.HTM: 283 243137 = 3 × 17 × 23 × 241469
Mersenne numbers with composite (factorable) exponents are never prime:
https://www.mersenneforum.org/showpo...13&postcount=4
so we know that 2283243137-1 has several factors and is not prime.

(OP may benefit from the beginning of the larger reference material at https://www.mersenneforum.org/showthread.php?t=24607)
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