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A138786 "Left" odd composite numbers n for which n < A140607((n-1)/2). 4
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 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

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.

Sequence in context: A174870 A141603 A262748 * A305733 A139392 A274720

Adjacent sequences:  A138783 A138784 A138785 * A138787 A138788 A138789

KEYWORD

nonn

AUTHOR

Vladimir Shevelev, May 18 2008

EXTENSIONS

Extended by Ray Chandler, May 20 2008

STATUS

approved

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Last modified October 17 21:17 EDT 2021. Contains 348065 sequences. (Running on oeis4.)