1,2

A permutation of the positive integers.

Table of n, a(n) for n=1..72.

To compute a(8), we see a(7) is 9; we look for the smallest unused positive integer that does not have the same prime signature as either 8, 9 or 10. The first such number is 2.

Cf. A179371

Sequence in context: A075254 A284913 A139203 * A240024 A227405 A061408

Adjacent sequences: A179369 A179370 A179371 * A179373 A179374 A179375

nonn

Will Nicholes, Jul 11 2010

approved