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URL: https://oeis.org/A095204

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A095204
a(n) is the smallest number greater than a(n-1) such that in a(0) through a(n) no digit occurs more than once more than any other digit.
4
0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 23, 45, 67, 89, 90, 123, 456, 478, 501, 623, 789, 790, 812, 3456, 3457, 6012, 6089, 7123, 8459, 8460, 9123, 9157, 20345, 20678, 31456, 31789, 40256, 40789, 51236, 51789, 60234, 60789, 71234, 71589, 80234, 80569, 91234, 91567
OFFSET
0,3
COMMENTS
Question: Formula for a(n)?
Note that, almost always, if the number of digits in a(0) through a(n) is a multiple of 10, a(n+1) = a(n) + 1. (The only exceptions would be if a(n) + 1 had some digit two more times than some other digit.) - Franklin T. Adams-Watters, Jan 11 2006
LINKS
EXAMPLE
After 10 the next term is 23 and not 11. Any number containing 0 or 1 would occur only after all the digits from 2 to 9 have occurred once.
MAPLE
counts:= Array(0..9):
cp:= Array(0..9):
counts[0]:= 1:
A[0]:= 0:
for n from 1 to 70 do
for x from A[n-1]+1 do
L:= convert(x, base, 10);
ArrayTools:-Copy(counts, cp);
for t in L do cp[t]:= cp[t]+1 od:
if max(cp) - min(cp) <= 1 then
A[n]:= x;
ArrayTools:-Copy(cp, counts);
break
fi
od
od:
seq(A[i], i=0..70); # Robert Israel, Sep 03 2015
CROSSREFS
Cf. A120125 (non-monotonic version).
Sequence in context: A120125 A345227 A333832 * A106604 A095205 A344325
KEYWORD
base,nonn
AUTHOR
Amarnath Murthy, Jun 06 2004
EXTENSIONS
Edited, corrected and extended by Franklin T. Adams-Watters, Jan 11 2006
STATUS
approved