A100490 Odd numbers ending in {1,3,7,9} that are not primes.

1, 9, 21, 27, 33, 39, 49, 51, 57, 63, 69, 77, 81, 87, 91, 93, 99, 111, 117, 119, 121, 123, 129, 133, 141, 143, 147, 153, 159, 161, 169, 171, 177, 183, 187, 189, 201, 203, 207, 209, 213, 217, 219, 221, 231, 237, 243, 247, 249, 253, 259, 261, 267, 273, 279, 287

Offset: 0

Author

Roger L. Bagula, Nov 22 2004

Keywords

• nonn

Comments

Essentially the same as A053795. [From R. J. Mathar, Sep 02 2008]

Programs

Mathematica

Select[Range[1,311,2],MemberQ[{1,3,7,9},Mod[#,10]]&&!PrimeQ[#]&] (* Harvey P. Dale, Sep 01 2024 *)