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Search: id:A083201
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| A083201 |
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a(1) = 1. For n>1, let x = a(n-1)+1; then a(n) is the first prime in the sequence 2*x-1, 2*x-3, 4*x-1, 4*x-3, 8*x-1, 8*x-3, ..., (2^k)*x-1, (2^k)*x-3, ... |
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+0
2
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| 1, 3, 7, 13, 53, 107, 431, 863, 6911, 27647, 442367, 7247757311, 3710851743743, 7421703487487, 31875973759370105192447, 71778311772385457136805581255138607103
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OFFSET
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1,2
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EXAMPLE
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a(9) = 6911 because a(8)=863 and its sequence starts 1727, 1725, 3455, 3453, 6911, ...; 6911 is the first prime.
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CROSSREFS
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Cf. A084361.
Sequence in context: A020641 A062736 A103564 this_sequence A004060 A028491 A137474
Adjacent sequences: A083198 A083199 A083200 this_sequence A083202 A083203 A083204
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KEYWORD
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nonn
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AUTHOR
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Amarnath Murthy and Meenakshi Srikanth (amarnath_murthy(AT)yahoo.com), Apr 27 2003
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EXTENSIONS
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Edited by Don Reble (djr(AT)nk.ca), Jun 20 2003
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