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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
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).
CROSSREFS
KEYWORD
nonn
AUTHOR
Vladimir Shevelev, Jul 24 2010
EXTENSIONS
Extended beyond a(7) by R. J. Mathar, Dec 04 2011
STATUS
approved