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Noncototient -- from Wolfram MathWorld

Algebra Applied Mathematics Calculus and Analysis Discrete Mathematics Foundations of Mathematics Geometry History and Terminology Number Theory Probability and Statistics Recreational Mathematics Topology Alphabetical Index New in MathWorld Noncototient

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

See alsoNontotient

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Totient Function Explore with Wolfram|Alpha ReferencesGuy, 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|AlphaNoncototient Cite this as:

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

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