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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
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
Sequence in context: A126610 A087380 A152986 * A366717 A212541 A087994
KEYWORD
nonn
AUTHOR
Vladimir Shevelev, Dec 22 2014
STATUS
approved