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 A230414 Inverse function for injection A219650. 7
 0, 1, 2, 0, 0, 3, 4, 5, 0, 0, 6, 7, 8, 0, 0, 9, 10, 11, 0, 0, 0, 0, 0, 12, 13, 14, 0, 0, 15, 16, 17, 0, 0, 18, 19, 20, 0, 0, 21, 22, 23, 0, 0, 0, 0, 0, 24, 25, 26, 0, 0, 27, 28, 29, 0, 0, 30, 31, 32, 0, 0, 33, 34, 35, 0, 0, 0, 0, 0, 36, 37, 38, 0, 0, 39, 40, 41 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,3 COMMENTS a(0)=0; thereafter if n occurs as a term of A219650, a(n)=its position in A219650, otherwise zero. This works as an "inverse" function for A219650 in a sense that a(A219650(n)) = n for all n. LINKS Antti Karttunen, Table of n, a(n) for n = 0..10079 FORMULA a(n) = A230412(n) * A230413(n). a(n) = A230423(n)/2. PROG (Scheme) (define (A230414 n) (* (A230412 n) (A230413 n))) CROSSREFS Cf. A219650, A230423, A230424. A219658 gives the positions of zeros after the first one. Analogous sequence for binary system: A213714. Sequence in context: A188430 A013585 A261319 * A053653 A332629 A262174 Adjacent sequences:  A230411 A230412 A230413 * A230415 A230416 A230417 KEYWORD nonn AUTHOR Antti Karttunen, Oct 31 2013 STATUS approved

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Last modified August 2 21:30 EDT 2021. Contains 346429 sequences. (Running on oeis4.)