A083925 Inverse function of N -> N injection A057548.

0, 0, 0, 1, 0, 0, 0, 2, 3, 0, 0, 0, 0, 0, 0, 0, 0, 4, 5, 0, 6, 7, 8, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 9, 10, 0, 11, 12, 13, 0, 0, 0, 14, 15, 0, 16, 17, 18, 0, 19, 20, 21, 22, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0

Offset

0,8

Comments

a(1)=0 because A057548(0)=1, but a(n) = 0 also for those n which do not occur as values of A057548. All positive natural numbers occur here once.

Links

Table of n, a(n) for n=0..98.

Formula

a(n) = A083923(n)*A072771(n).

Crossrefs

a(A057548(n)) = n for all n. Cf. A083926-A083929, A083935.

Sequence in context: A013504 A230807 A173012 * A208150 A045830 A078771

Adjacent sequences: A083922 A083923 A083924 * A083926 A083927 A083928

Keyword

nonn

Author

Antti Karttunen, May 13 2003

Status

approved