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Search: id:A085769
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| A085769 |
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Total number of zeros in the decimal expansions of 2^n and 5^n. |
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+0
1
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| 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; listen)
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OFFSET
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1,12
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COMMENT
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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.
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REFERENCES
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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.
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LINKS
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C. A. Pickover, "Wonders of Numbers, Adventures in Mathematics, Mind and Meaning," Zentralblatt review
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EXAMPLE
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a(58)=1 because 10^58 = 288230376151711744 * 34694469519536141888238489627838134765625
and the latter two numbers contain only one zero between them.
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CROSSREFS
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Sequence in context: A066520 A054535 A054534 this_sequence A102552 A124034 A085978
Adjacent sequences: A085766 A085767 A085768 this_sequence A085770 A085771 A085772
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KEYWORD
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nonn
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AUTHOR
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Jason Earls (zevi_35711(AT)yahoo.com), Jul 22 2003
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