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Old 2020-11-19, 08:06   #14
paulunderwood
 
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Sep 2002
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Results for a=4:

[68368998319, 4]
[416032697359, 4]
[4752200398399, 4]

All semi-primes, p*q, where gcd(p-1,q-1)=2^i*3^j
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