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A251542 List of values A098550(n+2)/A098550(n) for those n for which A098550(n) is a prime. 8
2, 3, 5, 3, 3, 2, 5, 5, 5, 2, 3, 3, 2, 3, 7, 5, 3, 7, 5, 3, 5, 3, 7, 3, 7, 5, 3, 3, 5, 5, 3, 5, 3, 7, 7, 5, 5, 7, 5, 3, 5, 7, 7, 3, 5, 3, 3, 5, 5, 3, 3, 7, 3, 3, 5, 3, 5, 7, 3, 5, 7, 3, 3, 5, 11, 3, 5, 5, 5, 3, 5, 5, 5, 5, 7, 3, 7, 5, 5, 7, 3, 5, 5, 3, 3, 5, 3, 7, 7, 5 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

a(n) <= 17 for n <= 250000 (see A251543).

For n > 4: third column in A251715. - Reinhard Zumkeller, Dec 16 2014

a(n) <= 19 for n <= 10^6. - Chai Wah Wu, Dec 16 2014

LINKS

Chai Wah Wu, 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.

EXAMPLE

A098550(n) for n= 1..11 is 1,2,3,4,9,8,15,14,5,6,25. Each time you see a prime, divide the term two steps ahead by that prime. The result is 4/2=2, 9/3=3, 25/5=5,...

PROG

(Haskell)

a251542 n = a251542_list !! (n-1)

a251542_list = [div u v | (u, v) <- zip(drop 2 a098550_list) a098550_list,

                          a010051' v == 1]

-- Reinhard Zumkeller, Mar 11 2015

CROSSREFS

Cf. A098550, A251543. See A251544 for the actual values of A098550(n+2).

Cf. A251715.

Sequence in context: A254862 A172984 A072751 * A131971 A281158 A100742

Adjacent sequences:  A251539 A251540 A251541 * A251543 A251544 A251545

KEYWORD

nonn

AUTHOR

David Applegate and N. J. A. Sloane, Dec 15 2014

STATUS

approved

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Last modified May 28 10:09 EDT 2017. Contains 287240 sequences.