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Result:
status (?)	digits	number
P	657 (show)	(9^688*23-511)/8<657> = 9494767690...59<657>

More information

ECM

Primality proving
Proven by certificate
Size	53,812 bytes
Status	Verified
Created with	Primo (4.0.0 - alpha 11 - LG64)
Uploaded by	Anonymous
Date	February 18, 2021, 6:55 pm
Download	Download

Proof by N-1/N+1
N-1	(0.32% factored)
N+1	(1.282% factored)
Combined N-1/N+1-test	(1.602% factored)
Download helper file

Probable prime
Bases checked	2, 3, 5, 7, 11
Check base (2-255)

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