A138786 - OEIS

%I #5 Mar 30 2012 18:52:52

%S 9,21,25,27,35,45,49,55,69,75,77,81,93,95,99,105,115,119,121,125,133,

%T 135,141,143,147,153,155,161,165,169,175,187,189,203,207,209,213,215,

%U 217,219,221,225,231,235,237,243,245,247,253,259,261,267,279,285,287

%N "Left" odd composite numbers n for which n < A140607((n-1)/2).

%C There are odd composite numbers which are neither in this sequence nor in A140608. The first such number is 91, see A140667.

%H Ray Chandler, <a href="/A138786/b138786.txt">Table of n, a(n) for n=1..5713</a>

%Y Cf. A140607, A039649, A140140, A138193, A138217, A138227, A138535, A138536, A138537, A138539, A140141, A000010, A000040, A140608, A140667.

%K nonn

%O 1,1

%A _Vladimir Shevelev_, May 18 2008

%E Extended by _Ray Chandler_, May 20 2008