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!)
A138646 Primes p such that 5*p-2 is composite. 0
2, 7, 13, 19, 29, 31, 37, 41, 43, 61, 67, 73, 79, 83, 97, 103, 107, 109, 127, 139, 151, 157, 163, 167, 179, 181, 193, 199, 211, 223, 227, 229, 241, 251, 263, 269, 271, 277, 281, 283, 293, 307, 313, 331, 337, 349, 353, 359, 367, 373, 379, 389, 397, 409, 419 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
LINKS
EXAMPLE
5*2-2=8, 5*7-2=33, 5*13-2=63,...
MATHEMATICA
a={}; Do[p=Prime[n]; If[ !PrimeQ[5*p-2], AppendTo[a, p]], {n, 8^2}]; a
Select[Prime[Range[100]], !PrimeQ[5#-2]&] (* Harvey P. Dale, Dec 16 2012 *)
CROSSREFS
Sequence in context: A109346 A140550 A271114 * A118755 A231383 A156012
KEYWORD
nonn
AUTHOR
EXTENSIONS
More terms from Vincenzo Librandi, Apr 01 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 July 20 18:09 EDT 2024. Contains 374459 sequences. (Running on oeis4.)