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A059809
Numbers that do not contain exactly the same digits in two different smaller bases.
6
2, 3, 4, 5, 6, 8, 10, 12, 14, 18, 20, 24, 32, 48, 60, 72, 168, 720
OFFSET
1,1
COMMENTS
Also numbers that cannot be expressed as the two-digit numbers a b (base r) and b a (base s) for two different smaller bases r and s (i.e., 2-digit "reversals"), and the numbers that cannot be expressed as "reversals" of any length for two different smaller bases. I can prove this. - Francis J. McDonnell, Jul 28 2015
LINKS
Sascha Kurz, A059809 is finite (shows that there are no other terms) [Broken link]
EXAMPLE
8 written in bases 2 through 7 is 1000, 22, 20, 13, 12, 11 and none of these are permutations of another one.
CROSSREFS
Cf. A059808.
Sequence in context: A056864 A029032 A218906 * A327634 A121492 A182418
KEYWORD
base,nonn,fini,full
AUTHOR
Erich Friedman, Feb 24 2001
EXTENSIONS
More terms from Naohiro Nomoto, Oct 04 2001, who remarks that there are no others < 10000.
Offset set to 1 by Michel Marcus, Aug 03 2015
STATUS
approved