A138786 "Left" odd composite numbers n for which n < A140607((n-1)/2).

9, 21, 25, 27, 35, 45, 49, 55, 69, 75, 77, 81, 93, 95, 99, 105, 115, 119, 121, 125, 133, 135, 141, 143, 147, 153, 155, 161, 165, 169, 175, 187, 189, 203, 207, 209, 213, 215, 217, 219, 221, 225, 231, 235, 237, 243, 245, 247, 253, 259, 261, 267, 279, 285, 287

Offset: 1

Author

Vladimir Shevelev, May 18 2008

Keywords

• nonn

Comments

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

Links

• Ray Chandler, Table of n, a(n) for n=1..5713

Crossrefs

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

Extensions

Extended by Ray Chandler, May 20 2008