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A361104 a(n) = k such that A361103(k-1) = n, or -1 if n never appears in A361103. 2

%I #21 Mar 05 2023 20:51:02

%S 1,2,3,17,9,4,8,31,15,7,5,47,64,6,21,10,96,20,11,13,57,38,14,16,79,37,

%T 18,12,160,28,22,19,61,24,26,23,131,52,27,25,41,33,46,29,77,45,42,34,

%U 54,59,36,32,68,72,44,40,104,82,50,49,75,111,51,35,98,143,63,30,85

%N a(n) = k such that A361103(k-1) = n, or -1 if n never appears in A361103.

%C Imagine the offset of A361103 is 1, and assume it really is a permutation of the natural numbers. In tabular form, it is

%C ..1..2..3..4..5..6..7..8..9.10.11...

%C ..1..2..3..6.11.14.10..7..5.16..19...

%C Then the inverse permutation would be

%C ..1..2..3.17..9..4..8.31.15..7..5.47...

%C which is the present sequence.

%H N. J. A. Sloane, <a href="/A361104/b361104.txt">Table of n, a(n) for n = 1..2721</a>

%e A361103(16) = 4, so a(4) = 17.

%Y Cf. A360519, A361102, A336957, A361103.

%K nonn

%O 1,2

%A _Scott R. Shannon_ and _N. J. A. Sloane_, Mar 02 2023

%E Edited by _N. J. A. Sloane_, Mar 04 2023

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Last modified May 17 23:39 EDT 2024. Contains 372608 sequences. (Running on oeis4.)