

A251543


a(n) = smallest m such that b(m) is prime and b(m+2)/b(m) = prime(n), where b() = A098550().


2




OFFSET

1,1


COMMENTS

So far a(n) is very roughly 2^(3n6). Of course it is not known at present if this sequence is infinite (see A098550). It is not even known if there are infinitely many prime terms in A098550. [It is now known that A098550 is a permutation of the natural numbers, so all of the primes appear. See Applegate et al.  L. Edson Jeffery, Dec 30 2014]
a(8) appears to deviate from the formula 2^(3n6) and is closer to 2^19 (than 2^18).  Chai Wah Wu, Dec 16 2014


LINKS

Table of n, a(n) for n=1..8.
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.


CROSSREFS

Cf. A098550, A251542.
Sequence in context: A054544 A269993 A132537 * A248236 A153702 A280941
Adjacent sequences: A251540 A251541 A251542 * A251544 A251545 A251546


KEYWORD

nonn,more


AUTHOR

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


EXTENSIONS

a(8) from Chai Wah Wu, Dec 16 2014


STATUS

approved



