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 A252838 Let A098550(n) be prime. If A098550(n+1) is even, then suppose A098550(n+3), A098550(n+5), ..., A098550(n+(2*r-1)) are also even, while A098550(n+(2*r+1)) is odd. Then a(n)= A098550(n+(2*r-1))/2; if A098550(n+1) is odd, then a(n)=0. 1
 0, 11, 11, 11, 0, 0, 19, 31, 31, 0, 37, 43, 0, 47, 53, 59, 61, 71, 71, 73, 79, 89, 89, 101, 101, 103, 107, 109, 113, 127, 131, 137, 139, 149, 151, 157, 163, 167, 173, 179, 181, 191, 193, 197, 199, 211, 223 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS See comment in A252837. LINKS 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. FORMULA If conjecture in A252837 is true, then for n>=25, a(n) = prime(n+1). CROSSREFS Cf. A098550, A252837. Sequence in context: A126610 A087380 A152986 * A212541 A087994 A100755 Adjacent sequences:  A252835 A252836 A252837 * A252839 A252840 A252841 KEYWORD nonn AUTHOR Vladimir Shevelev, Dec 22 2014 STATUS approved

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Last modified August 17 21:16 EDT 2018. Contains 313817 sequences. (Running on oeis4.)