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Date: 22-10-2019
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Date: 30-9-2020
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Date: 14-11-2019
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An integer is said to be highly cototient if the equation
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has more solutions than the equations for all
, where
is the totient function.
The first few highly cototient numbers are 2, 4, 8, 23, 35, 47, 59, 63, 83, 89, ... (OEIS A100827).
The first few prime highly cototient numbers are 2, 23, 47, 59, 83, 89, 113, 167, 269, 389, 419, 509, ... (OEIS A105440).
REFERENCES:
Sloane, N. J. A. Sequences A100827 and A105440 in "The On-Line Encyclopedia of Integer Sequences."
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