There are infinitely many $n$ such that $\lambda(n) = k$ (Carmichael function)?
For example: $k = 4$.
How efficiently we can generate all $n$ for which $\lambda(n) = 4$?
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See here: http://math.stackexchange.com/questions/2088516/is-there-any-way-to-find-a-number-n-if-its-carmichael-function-is-given – Jan 18 '17 at 15:45
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Thanks! And the first (title) question? (It is infinite?) – Aurelio Jan 18 '17 at 15:48
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1No, definitely not infinite. For large enough $n$ we can be sure that $\lambda(n)>k$. – Joffan Jan 18 '17 at 15:50