A380706 n is the a(n)-th nonnegative integer having its set of decimal digits.

1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 3, 1, 1, 1, 1

Offset: 0

Author

Alois P. Heinz, Jan 30 2025

Keywords

• nonn
• look
• base

Comments

Different from A326307.

Examples

			a(101) = 3 because 101 is the 3rd nonnegative integer having its set of decimal digits: 10, 100, 101: {0,1}.
		

Links

• Alois P. Heinz, Table of n, a(n) for n = 0..65536

Crossrefs

Cf. A326307 (the same for multiset).

Programs

Maple

p:= proc() 0 end:
a:= proc(n) option remember; local t;
      t:= {convert(n, base, 10)[]}; p(t):= p(t)+1
    end:
seq(a(n), n=0..105);

Python

from collections import Counter
from itertools import count, islice
def agen(): # generator of terms
    digsetcount = Counter()
    for n in count(0):
        key = "".join(sorted(set(str(n))))
        digsetcount[key] += 1
        yield digsetcount[key]
print(list(islice(agen(), 106))) # Michael S. Branicky, Jan 30 2025