D-Number
المؤلف:
Makowski, A
المصدر:
"Generalization of Morrow,s D-Numbers." Simon Stevin 36, 71
الجزء والصفحة:
...
23-11-2020
1725
D-Number
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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