A164383 Composite numbers of the form 4 + some prime.

6, 9, 15, 21, 27, 33, 35, 45, 51, 57, 63, 65, 75, 77, 87, 93, 105, 111, 117, 135, 141, 143, 153, 155, 161, 171, 177, 183, 185, 195, 201, 203, 215, 231, 237, 243, 245, 255, 261, 267, 273, 275, 285, 287, 297, 315, 321, 335, 341, 351, 357, 363, 371, 377, 387, 393

Offset: 1

Author

Juri-Stepan Gerasimov, Aug 14 2009

Keywords

• nonn

Examples

			a(1)= 4+2(prime)=6 (composite). a(2)= 4+5(prime)=9 (composite). a(3)=4+11(prime) = 15 (composite).
		

Crossrefs

Cf. A000040, A002808, A107986, A046132.

Programs

Mathematica

Select[4+Prime[Range[100]],CompositeQ] (* Harvey P. Dale, Oct 24 2017 *)

Extensions

Edited, entries checked, by R. J. Mathar, Aug 20 2009