OFFSET
0,2
COMMENTS
According to Ogilvy and Anderson, 10^33 is the highest known power of ten that can be expressed as the product of two zero-free factors. "If there is another one, it is greater than 10^5000." p. 89
REFERENCES
C. Stanley Ogilvy and John T. Anderson, Excursions in Number Theory, Oxford University Press, 1966, p. 89.
Rudolph Ondrejka, Nonzero factors of 10^n, Recreational Mathematics Magazine, no. 6 (1961), p. 59.
EXAMPLE
10^2 = 4 * 25, so a(2) = 4.
CROSSREFS
KEYWORD
sign,base
AUTHOR
Jason Earls, Apr 02 2001
STATUS
approved