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A131646 Numbers that can be written from base 2 to base 18 using only the digits 0 to 9 (conjectured to be complete). 5
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; text; internal format)
OFFSET

1,3

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.

REFERENCES

B. R. Barwell, Numbers Without Letters, Journal of Recreational Mathematics, Vol. 25:3 (1993), 174-179.

LINKS

Table of n, a(n) for n=1..20.

Daniel Mondot, Puzzle. [broken link]

CROSSREFS

Cf. A146025, A146026, A146027, A146028, A146029.

Sequence in context: A048408 A199343 A118765 * A032864 A032888 A023791

Adjacent sequences:  A131643 A131644 A131645 * A131647 A131648 A131649

KEYWORD

fini,full,nonn,base

AUTHOR

Daniel Mondot, Sep 08 2007, Nov 02 2008

EXTENSIONS

Edited by Charles R Greathouse IV, Nov 01 2009

Reference added by William Rex Marshall, Oct 23 2011

STATUS

approved

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Last modified December 22 09:16 EST 2014. Contains 252339 sequences.