The OEIS mourns the passing of Jim Simons and is grateful to the Simons Foundation for its support of research in many branches of science, including the OEIS.
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!)
A049716 a(n) = 2*n + 1 - prevprime(2*n + 1). 5
1, 2, 2, 2, 4, 2, 2, 4, 2, 2, 4, 2, 4, 6, 2, 2, 4, 6, 2, 4, 2, 2, 4, 2, 4, 6, 2, 4, 6, 2, 2, 4, 6, 2, 4, 2, 2, 4, 6, 2, 4, 2, 4, 6, 2, 4, 6, 8, 2, 4, 2, 2, 4, 2, 2, 4, 2, 4, 6, 8, 10, 12, 14, 2, 4, 2, 4, 6, 2, 2, 4, 6, 8, 10, 2, 2, 4, 6, 2, 4, 6, 2, 4, 2, 4, 6, 2, 4, 6, 2, 2, 4 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
LINKS
FORMULA
a(n) = A049711(2*n+1). - R. J. Mathar, Oct 26 2015
EXAMPLE
n: 1 2 3 4 5 6 7 8 ...
2n+1: 3 5 7 9 11 13 15 17 ...
pp: 2 3 5 7 7 11 13 13 ...
diff: 1 2 2 2 4 2 2 4 ...
MAPLE
seq(2*n+1-prevprime(2*n+1), n=1..100); # Robert Israel, Jul 05 2018
MATHEMATICA
Table[2n+1-NextPrime[2n+1, -1], {n, 100}] (* Harvey P. Dale, Sep 21 2013 *)
PROG
(PARI) a(n) = 2*n+1-precprime(2*n); \\ Michel Marcus, Jul 06 2018
CROSSREFS
Sequence in context: A102430 A160691 A367626 * A361289 A188903 A366534
KEYWORD
nonn
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 May 30 14:34 EDT 2024. Contains 372968 sequences. (Running on oeis4.)