show/hide this revision's text 6 not asking for downvotes here

I recently answered this related question about the Carmichael function on math.SE. The algorithm uses an unconditional lower bound so it should work just as well for the totient function because $\lambda(x) \le \phi(x)$. My answer (the only one) has not been accepted and the question has a bounty which expires tomorrow. I should not like to receive a bounty by default for an incorrect answer, so I am posting this here now as an invitation for you to correct me on math.SE. It is not an efficient algorithm as this MO question demands, but I proffer it because no algorithm has yet been given to answer it.

Also related is Carmichael's totient function conjecture which is that there are no unique solutions to this equation.
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I recently answered this related question about the Carmichael function on math.SE. The algorithm uses an unconditional lower bound so it should work just as well for the totient function because $\lambda(x) \le \phi(x)$. My answer (the only one) has not yet been accepted and the question has a bounty which expires tomorrow. I should not like to receive a bounty by default for an incorrect answer, so I am posting this here now as an invitation for you to correct me. It is not an efficient algorithm as this MO question demands, but I proffer it because no algorithm has yet been given to answer it.

Also related is Carmichael's totient function conjecture which is that there are no unique solutions to this equation.
show/hide this revision's text 4 who corrects, mo corrects

I recently answered this related question about the Carmichael function on math.SE. The algorithm uses an unconditional lower bound so it should work just as well for the totient function because $\lambda(x) \le \phi(x)$. My answer (the only one) has not yet been accepted and the question has a bounty which expires tomorrow. I should not like to receive a bounty by default for an incorrect answer, so I am posting this here now as an invitation for you to correct me. It is not an efficient algorithm as this MO question demands, but I proffer it because no algorithm has yet been given to answer this MO questionit.

Also related is Carmichael's totient function conjecture which is that there are no unique solutions to this equation.
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