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Search: id:A163078
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| A163078 |
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Numbers n such that n$ - 1 is prime. Here '$' denotes the swinging factorial function (A056040). |
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+0
4
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| 3, 4, 5, 6, 7, 10, 13, 15, 18, 30, 35, 39, 41, 47, 49, 58, 83, 86, 102, 111, 137, 151, 195, 205, 226, 229, 317, 319, 321, 368, 389, 426, 444, 477, 534, 558, 567, 738, 804, 882, 1063
(list; graph; listen)
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OFFSET
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1,1
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REFERENCES
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Peter Luschny, "Divide, swing and conquer the factorial and the lcm{1,2,...,n}", preprint, April 2008.
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LINKS
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Peter Luschny, Swinging Primes.
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EXAMPLE
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4$-1=6-1=5 is prime, so 4 is in the sequence.
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MAPLE
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a := proc(n) select(x -> isprime(A056040(x)-1), [$0..n]) end:
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CROSSREFS
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Cf. A163077, A163079, A163080, A002982.
Sequence in context: A106155 A087190 A085038 this_sequence A050034 A039056 A047562
Adjacent sequences: A163075 A163076 A163077 this_sequence A163079 A163080 A163081
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KEYWORD
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nonn
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AUTHOR
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Peter Luschny (peter(AT)luschny.de), Jul 21 2009
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