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A083925
Inverse function of N -> N injection A057548.
7
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.
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
KEYWORD
nonn
AUTHOR
Antti Karttunen, May 13 2003
STATUS
approved