User:Borealbear
Revision as of 16:23, 22 April 2021 by Borealbear (talk | contribs)
AIME Qual
Congrats on finding this page! Here's a problem I made:
Suppose a positive integer with all digits non-zero is considered [i]almost unique[/i] if there are fewer than permutations of its digits. For example,
is [i]almost unique[/i] since it has
permutations,(
,
, and
), while
is not since it has
permutations, (
,
,
,
,
,
). How many [i]almost unique[/i] numbers less than
are there?