login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A153052 Numbers n such that 2*n + 5 is not a prime. 4
2, 5, 8, 10, 11, 14, 15, 17, 20, 22, 23, 25, 26, 29, 30, 32, 35, 36, 38, 40, 41, 43, 44, 45, 47, 50, 53, 55, 56, 57, 58, 59, 60, 62, 64, 65, 68, 69, 70, 71, 74, 75, 77, 78, 80, 82, 83, 85, 86, 89, 90, 91, 92, 95, 98, 99, 100, 101, 102, 104, 105, 106, 107, 108, 110 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

One less than the associated entry in A153238. - R. J. Mathar, Jan 05 2011

The terms are the values of 2*h*k + k + h - 2, where h and k are positive integers.- Vincenzo Librandi, Jan 19 2013

LINKS

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

MATHEMATICA

Select[Range[0, 150], !PrimeQ[2*# + 5] &] (* Vincenzo Librandi, Oct 16 2012 *)

PROG

(MAGMA) [n: n in [0..110]| not IsPrime(2*n+5)]; // Vincenzo Librandi, Oct 16 2012

CROSSREFS

Cf. A089038, A154680.

Sequence in context: A078345 A161817 A080228 * A338388 A237525 A290578

Adjacent sequences:  A153049 A153050 A153051 * A153053 A153054 A153055

KEYWORD

nonn,easy

AUTHOR

Vincenzo Librandi, Dec 17 2008

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
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified May 6 23:59 EDT 2021. Contains 343607 sequences. (Running on oeis4.)