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!)
A172015 Numbers of the form 6*k-+1 such that 6*k-1=prime and 6*k+1=nonprime. 2
23, 25, 47, 49, 53, 55, 83, 85, 89, 91, 113, 115, 131, 133, 167, 169, 173, 175, 233, 235, 251, 253, 257, 259, 263, 265, 293, 295, 317, 319, 353, 355, 359, 361, 383, 385, 389, 391, 401, 403, 443, 445, 449, 451, 467, 469, 479, 481, 491, 493, 503, 505, 509, 511 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
LINKS
MATHEMATICA
Select[Table[{6k-1, 6k+1}, {k, 1, 100}], PrimeQ[ #[[1]] ] && !PrimeQ[ #[[2]] ]&] // Flatten (* Jean-François Alcover, Nov 24 2016 *)
CROSSREFS
Sequence in context: A093805 A033629 A090311 * A112073 A050864 A111452
KEYWORD
nonn
AUTHOR
EXTENSIONS
Entries checked by R. J. Mathar, Apr 14 2010
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 04:13 EDT 2024. Contains 371235 sequences. (Running on oeis4.)