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

1,1

Links

Table of n, a(n) for n=1..56.

Example

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

Mathematica

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

Crossrefs

Cf. A000040, A002808, A107986, A046132.

Sequence in context: A316044 A316045 A316046 * A316047 A168544 A001748

Adjacent sequences: A164380 A164381 A164382 * A164384 A164385 A164386

Keyword

nonn

Author

Juri-Stepan Gerasimov, Aug 14 2009

Extensions

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

Status

approved