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Search: id:A113972
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| A113972 |
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Define b(0)=28, b(n+1)=2*b(n)+1; sequence gives largest prime factor of b(n). |
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1
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| 7, 19, 23, 11, 463, 103, 53, 1237, 571, 101, 5939, 6599, 239, 313, 95027, 1223, 1900543, 281, 43441, 1699, 2339131, 2896067, 1283, 3229, 3021983, 5317369, 389231411, 32869, 301999, 2339, 2154169, 98383927, 25015877, 340939
(list; graph; listen)
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OFFSET
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0,1
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EXAMPLE
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a(2)=23 because b(1)=2*28+1=57 and b(2)=2*57+1=115=5*23.
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MAPLE
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with(numtheory): b:=proc(n): if n=0 then 28 else 2*b(n-1)+1 fi: end: a:=proc(n) local bb: bb:=factorset(b(n)): bb[nops(bb)] end: seq(a(n), n=0..38); - Emeric Deutsch (deutsch(AT)duke.poly.edu), May 14 2006
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CROSSREFS
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Sequence in context: A039513 A125265 A123532 this_sequence A082422 A129812 A032680
Adjacent sequences: A113969 A113970 A113971 this_sequence A113973 A113974 A113975
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KEYWORD
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nonn
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AUTHOR
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Bill McEachen (BMCEACHE(AT)centralsan.dst.ca.us), Feb 06 2006
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EXTENSIONS
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More terms from Emeric Deutsch (deutsch(AT)duke.poly.edu), May 14 2006
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