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

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A253049 Numbers in A098550 which appear immediately after a prime. 4
 3, 4, 6, 10, 13, 33, 18, 42, 48, 31, 58, 70, 43, 82, 90, 102, 110, 120, 126, 140, 144, 154, 150, 182, 180, 198, 200, 220, 216, 228, 272, 252, 280, 270, 300, 306, 312, 330, 336, 340, 348, 360, 390, 392, 396, 400, 442, 438, 468, 440, 506, 480, 484, 500, 486, 518, 528, 540, 574, 546, 570, 572, 616 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS It is conjectured that this is the same as A253048 except for the addition of 3, 13, 31, and 43 (the upper members of the twin primes in A098550). a(n) = A098550(A251239(n)+1). - Reinhard Zumkeller, Dec 29 2014 LINKS Reinhard Zumkeller, Table of n, a(n) for n = 1..10000 David L. Applegate, Hans Havermann, Bob Selcoe, Vladimir Shevelev, N. J. A. Sloane, and Reinhard Zumkeller, The Yellowstone Permutation, arXiv preprint arXiv:1501.01669, 2015 and J. Int. Seq. 18 (2015) 15.6.7. MATHEMATICA f[lst_] := Block[{k = 4}, While[GCD[lst[[-2]], k] == 1 || GCD[lst[[-1]], k] > 1 || MemberQ[lst, k], k++]; Append[lst, k]]; A098550 = Nest[f, {1, 2, 3}, 1000]; sp = SequencePosition[A098550, {_?PrimeQ, _}] [[All, 2]]; A098550[[sp]] (* Jean-François Alcover, Sep 03 2018, after Robert G. Wilson v in A098550 *) CROSSREFS Cf. A098550. See A253048 for another version. Cf. A251239. Sequence in context: A310002 A240577 A074321 * A167410 A302340 A310003 Adjacent sequences: A253046 A253047 A253048 * A253050 A253051 A253052 KEYWORD nonn AUTHOR N. J. A. Sloane, Dec 27 2014 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 January 27 06:42 EST 2023. Contains 359837 sequences. (Running on oeis4.)