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Old 2020-06-15, 19:07   #4
Batalov
 
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"Serge"
Mar 2008
Phi(4,2^7658614+1)/2

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https://primes.utm.edu/top20/page.php?id=41

https://mersenneforum.org/showthread.php?t=19235

https://oeis.org/A057429 = https://oeis.org/A007670 + https://oeis.org/A007671
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