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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

Table of n, a(n) for n=1..47.

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.

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 July 25 10:20 EDT 2017. Contains 289792 sequences.