A207802 Permutation of positive numbers. See comments.

1, 2, 3, 4, 5, 8, 6, 16, 7, 32, 9, 64, 10, 128, 12, 256, 11, 512, 18, 1024, 15, 2048, 24, 4096, 14, 8192, 27, 16384, 20, 32768, 36, 65536, 13, 131072, 48, 262144, 25, 524288, 54, 1048576, 21, 2097152, 72, 4194304, 30, 8388608, 81, 16777216, 22, 33554432, 96, 67108864, 40, 134217728, 108

Offset: 1

Author

Vladimir Shevelev and Peter J. C. Moses, Feb 20 2012

Keywords

• nonn

Comments

a(1)=1; on places 2,4,6,8,... we put 2^m, m=1,2,3,..., i.e., numbers with the greatest prime divisor p_1=2; on places 3,7,11,15,... we put numbers with the greatest prime divisor p_2=3; on places 5,13,21,29,... we put numbers with the greatest prime divisor p_3=5; etc.

For general description of the order, see the comment in A207790.

Crossrefs

Cf. A207790, A207800, A207801.

Formula

For n>1, a(n) = A125624(A209268(n-1)). - Ivan Neretin, Apr 30 2016

Extensions

a(30) fixed by Ivan Neretin, Apr 30 2016