A375216 - OEIS

A375216

n is the a(n)-th nonnegative integer having its multiset of binary digits.

1, 1, 1, 1, 1, 1, 2, 1, 1, 1, 2, 1, 3, 2, 3, 1, 1, 1, 2, 1, 3, 2, 3, 1, 4, 4, 5, 2, 6, 3, 4, 1, 1, 1, 2, 1, 3, 2, 3, 1, 4, 4, 5, 2, 6, 3, 4, 1, 5, 7, 8, 5, 9, 6, 7, 2, 10, 8, 9, 3, 10, 4, 5, 1, 1, 1, 2, 1, 3, 2, 3, 1, 4, 4, 5, 2, 6, 3, 4, 1, 5, 7, 8, 5, 9, 6, 7, 2, 10, 8, 9, 3, 10, 4, 5, 1, 6, 11, 12, 11, 13

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OFFSET

0,7

LINKS

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

FORMULA

Ordinal transform of A073137.

EXAMPLE

a(26) = 5 because 26 is the 5th nonnegative integer having its multiset of binary digits: 19 = 10011_2, 21 = 10101_2, 22 = 10110_2, 25 = 11001_2, 26 = 11010_2.

MAPLE

p:= proc() 0 end:

a:= proc(n) option remember; local t;

t:= sort(Bits[Split](n)); p(t):= p(t)+1

end:

seq(a(n), n=0..100);

CROSSREFS

Cf. A073137.

Sequence in context: A350333 A138010 A206487 * A209062 A167204 A376758

Adjacent sequences: A375213 A375214 A375215 * A375217 A375218 A375219

KEYWORD

nonn,look,base

AUTHOR

Alois P. Heinz, Jan 30 2025

STATUS

approved