login
This site is supported by donations to The OEIS Foundation.

 

Logo

"Email this user" was broken Aug 14 to 9am Aug 16. If you sent someone a message in this period, please send it again.

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A241571 Numbers n such that 2*n+15 is not a prime. 2
0, 3, 5, 6, 9, 10, 12, 15, 17, 18, 20, 21, 24, 25, 27, 30, 31, 33, 35, 36, 38, 39, 40, 42, 45, 48, 50, 51, 52, 53, 54, 55, 57, 59, 60, 63, 64, 65, 66, 69, 70, 72, 73, 75, 77, 78, 80, 81, 84, 85, 86, 87, 90, 93, 94, 95, 96, 97, 99, 100, 101, 102, 103, 105, 108 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Vincenzo Librandi, Table of n, a(n) for n = 1..1000

MATHEMATICA

Select[Range[0, 200], !PrimeQ[2 # + 15] &]

PROG

(MAGMA) [n: n in [0..200] | not IsPrime(2*n+15)];

CROSSREFS

Complement of A089559.

Cf. similar sequence listed in A153144.

Sequence in context: A227455 A237417 A165740 * A080307 A001969 A075311

Adjacent sequences:  A241568 A241569 A241570 * A241572 A241573 A241574

KEYWORD

nonn,easy

AUTHOR

Vincenzo Librandi, Apr 27 2014

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent | More pages
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy .

Last modified August 21 17:49 EDT 2017. Contains 290892 sequences.