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 A083201 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, ... 1
 1, 3, 7, 13, 53, 107, 431, 863, 6911, 27647, 442367, 7247757311, 3710851743743, 7421703487487, 31875973759370105192447, 71778311772385457136805581255138607103 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 LINKS EXAMPLE a(9) = 6911 because a(8)=863 and its sequence starts 1727, 1725, 3455, 3453, 6911, ...; 6911 is the first prime. CROSSREFS Cf. A084361. Sequence in context: A062736 A257716 A103564 * A228209 A176903 A004060 Adjacent sequences:  A083198 A083199 A083200 * A083202 A083203 A083204 KEYWORD nonn AUTHOR Amarnath Murthy and Meenakshi Srikanth (menakan_s(AT)yahoo.com), Apr 27 2003 EXTENSIONS Edited by Don Reble, Jun 20 2003 STATUS approved

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Last modified September 25 02:25 EDT 2021. Contains 347651 sequences. (Running on oeis4.)