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A269379 a(1) = 1; for n > 1, a(n) = A255127(A260738(n)+1, A260739(n)). 18

%I #6 Mar 03 2016 22:50:38

%S 1,3,5,9,7,15,11,21,19,27,13,33,17,39,35,45,23,51,31,57,49,63,25,69,

%T 29,75,65,81,37,87,55,93,79,99,59,105,41,111,95,117,43,123,47,129,109,

%U 135,53,141,85,147,125,153,61,159,73,165,139,171,103,177,67,183,155,189,113,195,71,201,169,207,77,213,101,219,185,225,83

%N a(1) = 1; for n > 1, a(n) = A255127(A260738(n)+1, A260739(n)).

%C a(n) = the number located immediately below n in A255127 (square array generated by Ludic sieve) in the same column where n itself is, or in other words, the number removed in the next filtering stage at the same step as when n was removed in the A260738(n)-th stage.

%C Permutation of odd numbers.

%H Antti Karttunen, <a href="/A269379/b269379.txt">Table of n, a(n) for n = 1..32999</a>

%F a(1) = 1; for n > 1, a(n) = A255127(A260738(n)+1, A260739(n)).

%F Other identities. For all n >= 1:

%F A269380(a(n)) = n.

%o (Scheme) (define (A269379 n) (if (= 1 n) n (A255127bi (+ (A260738 n) 1) (A260739 n)))) ;; Code for A255127bi given in A255127.

%Y Cf. A255127, A260738, A260739.

%Y Cf. A269171, A269356, A269358, A269382, A269385, A269387 (sequences that use this function).

%Y Cf. A269380 (left inverse).

%Y Cf. also A250469, A269369.

%K nonn

%O 1,2

%A _Antti Karttunen_, Mar 01 2016

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Last modified April 25 07:53 EDT 2024. Contains 371964 sequences. (Running on oeis4.)