login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A007636 Numbers k such that k^2 + k + 17 is composite.
(Formerly M4996)
2
16, 17, 20, 25, 32, 33, 34, 36, 39, 41, 43, 48, 50, 51, 52, 54, 55, 58, 61, 65, 66, 67, 68, 69, 71, 74, 77, 78, 80, 83, 84, 85, 88, 89, 90, 93, 94, 96, 97, 99, 100, 101, 102, 105, 106, 107, 111, 112, 115, 116, 117, 118, 119, 122, 124, 126, 131, 134, 135, 136, 137 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Complement of A028823. - Michel Marcus, Jun 17 2013
REFERENCES
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
LINKS
MATHEMATICA
Select[Range[200], !PrimeQ[#^2 + # + 17] &] (* Vincenzo Librandi, Jun 08 2017 *)
PROG
(Magma) [n: n in [0..200]| not IsPrime(n^2+n+17)]; // Vincenzo Librandi, Jun 08 2017
CROSSREFS
Sequence in context: A138599 A258265 A261344 * A241751 A244431 A151977
KEYWORD
nonn,easy
AUTHOR
STATUS
approved

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

License Agreements, Terms of Use, Privacy Policy. .

Last modified March 28 09:04 EDT 2024. Contains 371240 sequences. (Running on oeis4.)