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Noncototient


A positive value of n for which x-phi(x)=n has no solution, where phi(x) is the totient function. The first few are 10, 26, 34, 50, 52, ... (OEIS A005278).


See also

Nontotient, Totient Function

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References

Guy, R. K. Unsolved Problems in Number Theory, 2nd ed. New York: Springer-Verlag, p. 91, 1994.Sloane, N. J. A. Sequence A005278/M4688 in "The On-Line Encyclopedia of Integer Sequences."

Referenced on Wolfram|Alpha

Noncototient

Cite this as:

Weisstein, Eric W. "Noncototient." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/Noncototient.html

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