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A085199
Inverse function of N -> N injection A071156.
1
0, 1, 0, 2, 0, 3, 0, 0, 0, 4, 0, 5, 0, 0, 0, 6, 0, 7, 0, 0, 0, 0, 0, 8, 0, 0, 0, 0, 0, 0, 0, 0, 0, 9, 0, 10, 0, 0, 0, 11, 0, 12, 0, 0, 0, 0, 0, 13, 0, 0, 0, 0, 0, 0, 0, 0, 0, 14, 0, 15, 0, 0, 0, 16, 0, 17, 0, 0, 0, 0, 0, 18, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 19, 0, 20, 0, 0, 0, 0, 0, 21, 0, 0, 0
OFFSET
0,4
COMMENTS
a(0)=0 because A071156(0)=0, but a(n) = 0 also for those n which do not occur as values of A071156. All positive natural numbers occur here once.
FORMULA
a(n) = A057164(A085200(n)).
CROSSREFS
a(A071156(n)) = n for all n.
Sequence in context: A142971 A104117 A114511 * A338504 A085200 A080024
KEYWORD
nonn
AUTHOR
Antti Karttunen, Jun 14 2003
STATUS
approved