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!)
A105549 Numbers n such that 2*prime(n)+/-n are primes. 1
1, 3, 15, 27, 33, 45, 81, 189, 213, 243, 249, 279, 285, 291, 381, 423, 567, 615, 675, 687, 705, 813, 819, 1023, 1071, 1077, 1137, 1173, 1347, 1425, 1431, 1503, 1737, 1779, 1785, 1815, 1857, 1989, 1995, 2049, 2067, 2163, 2241, 2373, 2565, 2841 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
LINKS
MATHEMATICA
bb={}; Do[If[PrimeQ[2 Prime[n]+n]&&PrimeQ[2 Prime[n]-n], bb=Append[bb, n]], {n, 1, 3000, 2}]; bb
Select[Range[3000], And@@PrimeQ[2Prime[#]+{#, -#}]&] (* Harvey P. Dale, Apr 07 2013 *)
CROSSREFS
Sequence in context: A027179 A110703 A121250 * A080065 A017557 A147041
KEYWORD
nonn
AUTHOR
Zak Seidov, May 03 2005
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 April 14 18:28 EDT 2024. Contains 371667 sequences. (Running on oeis4.)