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

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A100802 a(n) = least k >= 0 such that (n+k)/2 is prime. 2
 4, 3, 2, 1, 0, 1, 0, 3, 2, 1, 0, 3, 2, 1, 0, 7, 6, 5, 4, 3, 2, 1, 0, 3, 2, 1, 0, 7, 6, 5, 4, 3, 2, 1, 0, 3, 2, 1, 0, 7, 6, 5, 4, 3, 2, 1, 0, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0, 3, 2, 1, 0, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0, 7, 6, 5, 4, 3, 2, 1, 0, 3, 2, 1, 0, 7, 6, 5, 4, 3, 2, 1, 0, 11, 10, 9, 8, 7, 6, 5 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,1 COMMENTS If a(n) = k is nonzero then a(n+1) = k-1. a(2p) = 0 for p prime. LINKS Harvey P. Dale, Table of n, a(n) for n = 0..1000 MATHEMATICA a = {}; Do[k = 0; While[ ! PrimeQ[(n + k)/2], k++ ]; AppendTo[a, k]; , {n, 0, 120}]; a (* Ray Chandler, Jan 19 2005 *) lk[n_]:=Module[{k=If[EvenQ[n], 0, 1]}, While[!PrimeQ[(n+k)/2], k=k+2]; k]; Array[lk, 120, 0] (* Harvey P. Dale, Nov 25 2016 *) CROSSREFS Cf. A100803. Sequence in context: A350493 A327351 A239475 * A022960 A023446 A258447 Adjacent sequences: A100799 A100800 A100801 * A100803 A100804 A100805 KEYWORD nonn,easy AUTHOR Amarnath Murthy, Dec 18 2004 EXTENSIONS Extended by Ray Chandler, Jan 19 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.

Last modified April 12 19:05 EDT 2024. Contains 371636 sequences. (Running on oeis4.)