login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A085769 Total number of zeros in the decimal expansions of 2^n and 5^n. 0
0, 0, 0, 0, 0, 0, 0, 1, 0, 1, 1, 2, 2, 1, 1, 1, 1, 0, 1, 2, 2, 2, 3, 2, 1, 2, 2, 2, 3, 1, 1, 2, 0, 3, 3, 2, 2, 4, 3, 5, 2, 3, 4, 5, 8, 5, 5, 6, 4, 4, 4, 8, 9, 5, 7, 4, 3, 1, 5, 6, 8, 8, 9, 10, 7, 7, 5, 8, 11, 11, 7, 8, 5, 4, 4, 6, 5, 6, 8, 10, 7, 6, 7, 4, 2, 4, 9, 9, 7, 9, 9, 8, 10, 10, 5, 5, 8, 11, 14, 18 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,12
COMMENTS
10^33 is believed to be the largest power of 10 that can be expressed as the product of 2 numbers which contain no zero digits.
REFERENCES
C. Stanley Ogilvy and John T. Anderson, Excursions in Number Theory. Dover. New York: 1988. Page 89.
C. Pickover, Wonders of Numbers, Oxford University Press, NY, 2001, pp. 201-202, 353.
LINKS
C. A. Pickover, "Wonders of Numbers, Adventures in Mathematics, Mind and Meaning," Zentralblatt review
EXAMPLE
a(58)=1 because 10^58 = 288230376151711744 * 34694469519536141888238489627838134765625
and the latter two numbers contain only one zero between them.
CROSSREFS
Sequence in context: A334091 A054535 A054534 * A237422 A102552 A131341
KEYWORD
nonn,base
AUTHOR
Jason Earls, Jul 22 2003
STATUS
approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified March 3 21:58 EST 2024. Contains 370518 sequences. (Running on oeis4.)