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A181096 Permutation of positive integers created from sequence A018252(n) = nonprimes. 1

%I

%S 1,4,6,2,8,3,9,5,7,10,12,11,14,13,15,16,18,17,20,19,21,22,24,23,25,26,

%T 27,28,30,29,32,31,33,34,35,36,38,37,39,40,42,41,44,43,45,46,48,47,49,

%U 50,51,52,54,53,55,56,57,58,60,59,62,61,63,64,65,66,68,67,69,70,72,71

%N Permutation of positive integers created from sequence A018252(n) = nonprimes.

%C Method of creation of sequence a(n) from b(n) = A018252(n):

%C Take b(1) and put in vacancy place a(1), swap this place and b(1), repeat with b(2), b(3), ...:

%C b(1) = 1, a(1) = 1,

%C b(2) = 4, a(2) = 4, a(4) = 2,

%C b(3) = 6, a(3) = 6, a(6) = 3,

%C b(4) = 8, a(5) = 8, a(8) = 5,

%C b(5) = 9, a(7) = 9, a(9) = 7,

%C ...

%F a(n) = A135761(n) for n >= 11. a(n) = A181097(n) for n >= 11.

%K nonn

%O 1,2

%A _Jaroslav Krizek_, Oct 02 2010

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Last modified August 1 01:55 EDT 2021. Contains 346377 sequences. (Running on oeis4.)