

A084398


Except for a(1) = 1, rearrangement of natural numbers such that a(n) is not equal to n, but the prime signature of a(n) is the same as that of n.


1



1, 3, 2, 9, 7, 10, 5, 27, 4, 6, 13, 18, 11, 15, 14, 81, 19, 12, 17, 28, 22, 21, 29, 40, 49, 33, 8, 20, 23, 42, 37, 243, 26, 35, 34, 100, 31, 39, 38, 24, 43, 30, 41, 45, 44, 51, 53, 80, 25, 52, 46, 50, 47, 56, 57, 54, 55, 62, 61, 84, 59, 58, 68, 729, 69, 70, 71, 63, 65, 66, 67, 108
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OFFSET

1,2


COMMENTS

a(a(n)) = n.  Amarnath Murthy and Meenakshi Srikanth (menakan_s(AT)yahoo.com), Jun 20 2003


LINKS

Paul Tek, Table of n, a(n) for n = 1..10000
Paul Tek, PERL program for this sequence


EXAMPLE

The first 4 numbers with the prime signature p*q are 6, 10, 14 and 15, so a(6) = 10, a(10) = 6, a(14) = 15 and a(15) = 14.


PROG

(Perl) See Links section.


CROSSREFS

Cf. A046523.
Sequence in context: A061898 A021756 A274925 * A118306 A237651 A124003
Adjacent sequences: A084395 A084396 A084397 * A084399 A084400 A084401


KEYWORD

easy,nonn


AUTHOR

Amarnath Murthy, May 31 2003


EXTENSIONS

More terms from David Wasserman, Dec 21 2004


STATUS

approved



