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

0,2

Comments

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

Links

Table of n, a(n) for n=0..55.

Mathematica

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

Crossrefs

Sequence in context: A173456 A192192 A053795 * A173250 A128462 A186815

Adjacent sequences: A100487 A100488 A100489 * A100491 A100492 A100493

Keyword

nonn

Author

Roger L. Bagula, Nov 22 2004

Status

approved