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A179687
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a(n) = 2*q(n)-1 where q(n) is the sequence of records positions of A179686
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2
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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
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OFFSET
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1,1
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COMMENTS
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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).
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LINKS
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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EXTENSIONS
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Extended beyond a(7) by R. J. Mathar, Dec 04 2011
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STATUS
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approved
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