A073870 - OEIS

%I #7 Dec 05 2013 19:55:32

%S 4,6,9,8,10,12,14,16,18,20,22,24,26,28,15,32,34,36,38,40,21,44,46,48,

%T 25,52,27,56,58,30,62,64,33,68,35,72,74,76,39,80,82,42,86,88,45,92,94,

%U 96,49,50,51,104,106,54,55,112,57,116,118,60,122,124,63,128,65,66,134,136

%N Smallest composite number not included earlier that is a multiple of n.

%C A permutation of the composite numbers.

%F It appears that for n>3, if n is an odd composite number then a(n) = n, otherwise a(n) = 2n.

%Y Cf. A073871.

%K nonn

%O 1,1

%A _Amarnath Murthy_, Aug 16 2002

%E Corrected and extended by _Franklin T. Adams-Watters_, May 12 2006

%E Edited by _N. J. A. Sloane_, May 05 2007