A Natural Number such that

whenever ( and are Relatively Prime) and . There are an infinite number of such numbers, the first few being 9, 15, 21, 33, 39, 51, ... (Sloane's A033553).

**References**

Makowski, A. ``Generalization of Morrow's -Numbers.'' *Simon Stevin* **36**, 71, 1962/1963.

Sloane, N. J. A. Sequence A033553 in ``The On-Line Version of the Encyclopedia of Integer Sequences.'' http://www.research.att.com/~njas/sequences/eisonline.html.

© 1996-9

1999-05-24