A181097 Permutation of positive integers created from sequence A002808(n) = composites.

4, 6, 8, 1, 9, 2, 10, 3, 5, 7, 12, 11, 14, 13, 15, 16, 18, 17, 20, 19, 21, 22, 24, 23, 25, 26, 27, 28, 30, 29, 32, 31, 33, 34, 35, 36, 38, 37, 39, 40, 42, 41, 44, 43, 45, 46, 48, 47, 49, 50, 51, 52, 54, 53, 55, 56, 57, 58, 60, 59, 62, 61, 63, 64, 65, 66, 68, 67, 69, 70, 72, 71

Offset: 1

Author

Jaroslav Krizek, Oct 02 2010

Keywords

• nonn

Comments

Method of creation of sequence a(n) from b(n) = A002808(n):

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

b(1) = 4, a(1) = 4, a(4) = 1,

b(2) = 6, a(2) = 6, a(6) = 2,

b(3) = 8, a(3) = 8, a(8) = 3,

b(4) = 9, a(5) = 9, a(9) = 5,

b(5) = 10, a(7) = 10, a(10) = 7,

...

Formula

a(n) = A135761(n) for n >= 11. a(n) = A181096(n) for n >= 11.