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A179687 a(n) = 2*q(n)-1 where q(n) is the sequence of records positions of A179686 2
3, 5, 7, 19, 27, 37, 47, 53, 67, 95, 101, 103, 107, 131, 149, 173, 181, 191, 227, 239, 263, 293, 311, 317, 349, 359, 367, 373, 383, 419, 461, 463, 479, 509, 547, 557, 587, 613, 619, 647, 653, 677, 701, 743, 751, 773, 787, 821, 841, 863, 887, 947 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

The record positions are q(n) = 2, 3, 4, 10, 14, 19, 24, 27, 34,...

Sequences A179382, A179383, A179480, A179481, A179686 and this sequence show that their terms depend on prime power factorization of 2*n-1. Nevertheless, this question yet is waiting its research. Most likely that almost all terms of this sequence are primes (27, 95, 841,... are not).

LINKS

Table of n, a(n) for n=1..52.

CROSSREFS

Cf. A179382, A179383, A179480, A179481, A179686

Sequence in context: A154524 A184805 A079131 * A106919 A005850 A052334

Adjacent sequences:  A179684 A179685 A179686 * A179688 A179689 A179690

KEYWORD

nonn

AUTHOR

Vladimir Shevelev, Jul 24 2010

EXTENSIONS

Extended beyond a(7) by R. J. Mathar, Dec 04 2011

STATUS

approved

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Last modified October 18 00:21 EDT 2019. Contains 328135 sequences. (Running on oeis4.)