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A131646
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Numbers that can be written from base 2 to base 18 using only the digits 0 to 9 (conjectured to be complete).
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5
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0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 18, 19, 20, 1027, 1028, 1029, 14745, 9020076688681, 9439828025162228377, 9439829801208141318
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,3
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COMMENTS
| It appears that 19 and 20 are the only numbers > 9 that can be written up to base 19 only using digits 0 to 9 and 20 is the only number > 9 that can be written up to base 20 only using digits 0 to 9.
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REFERENCES
| B. R. Barwell, Numbers Without Letters, Journal of Recreational Mathematics, Vol. 25:3 (1993), 174-179.
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LINKS
| Daniel Mondot, Puzzle.
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CROSSREFS
| Cf. A146025, A146026, A146027, A146028, A146029.
Sequence in context: A048408 A199343 A118765 * A032864 A032888 A023791
Adjacent sequences: A131643 A131644 A131645 * A131647 A131648 A131649
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KEYWORD
| fini,full,nonn,base
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AUTHOR
| Daniel Mondot, Sep 08 2007, Nov 02 2008
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EXTENSIONS
| Edited by Charles R Greathouse IV (charles.greathouse(AT)case.edu), Nov 01 2009
Reference added by William Rex Marshall (w.r.marshall(AT)actrix.co.nz), Oct 23 2011
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