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A251544 List of values of A098550(n+2) for those n for which A098550(n) is a prime. 10
4, 9, 25, 21, 33, 26, 85, 95, 115, 58, 93, 111, 82, 129, 329, 265, 177, 427, 335, 213, 365, 237, 581, 267, 679, 505, 309, 321, 545, 565, 381, 655, 411, 973, 1043, 755, 785, 1141, 835, 519, 895, 1267, 1337, 579, 985, 597, 633, 1115, 1135, 687, 699, 1673, 723, 753 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

For n > 4: third column in A251637. - Reinhard Zumkeller, Dec 16 2014

LINKS

N. J. A. Sloane, Table of n, a(n) for n = 1..11246

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

max = 600;

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}, max - 3];

sel = Select[Transpose[{Range[max], A098550}], PrimeQ[#[[2]]]&][[All, 1]]+2;

A098550[[sel]] (* Jean-Fran├žois Alcover, Sep 05 2018, after Robert G. Wilson v in A098550 *)

CROSSREFS

Cf. A098550, A251542 (another version). See A251545 for the sorted values.

Cf. A251637.

Sequence in context: A133905 A131826 A051961 * A175119 A093867 A126638

Adjacent sequences:  A251541 A251542 A251543 * A251545 A251546 A251547

KEYWORD

nonn

AUTHOR

David Applegate and N. J. A. Sloane, Dec 16 2014

STATUS

approved

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Last modified October 20 22:38 EDT 2018. Contains 316404 sequences. (Running on oeis4.)