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Date: 27-9-2020
633
Date: 15-9-2020
1525
Date: 7-11-2020
772
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A natural number such that
whenever ( and are relatively prime) and . (Here, means that divides .) There are an infinite number of such numbers, the first few being 9, 15, 21, 33, 39, 51, ... (OEIS A033553).
The -numbers are the same as the 3-Knödel numbers.
REFERENCES:
Makowski, A. "Generalization of Morrow's -Numbers." Simon Stevin 36, 71, 1962/1963.
Sloane, N. J. A. Sequence A033553 in "The On-Line Encyclopedia of Integer Sequences."
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