The superfactorial of is defined by Pickover (1995) as

The first two values are 1 and 4, but subsequently grow so rapidly that already has a huge number of digits.

Sloane and Plouffe (1995) define the superfactorial by

which is equivalent to the integral values of the

**References**

Pickover, C. A. *Keys to Infinity.* New York: Wiley, p. 102, 1995.

Sloane, N. J. A. Sequence
A000178/M2049
in ``An On-Line Version of the Encyclopedia of Integer Sequences.''
http://www.research.att.com/~njas/sequences/eisonline.html and Sloane, N. J. A. and Plouffe, S.
*The Encyclopedia of Integer Sequences.* San Diego: Academic Press, 1995.

© 1996-9

1999-05-26