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Search: id:A051130
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OFFSET
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1,1
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COMMENT
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Bell(2841) was shown to be a probable prime by Phil Carmody (Dec 22 2002). It has 6531 digits.
Bell(2841) has been certified to be a prime using Primo. This took 17 months on a P3-800, a P4-2400 and finally a P4-2800. There are no other terms below 6000. - Ignacio Larrosa Canestro, Feb 13, 2004
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REFERENCES
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E. T. Bell, Exponential numbers, Amer. Math. Monthly, 41 (1934), 411-419.
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LINKS
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Eric Weisstein's World of Mathematics, Bell Numbers
Eric Weisstein's World of Mathematics, Bell Number
Eric Weisstein's World of Mathematics, Integer Sequence Primes
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EXAMPLE
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The Bell numbers Bell(2)=2, Bell(3)=5, Bell(7)=877 etc. are primes.
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CROSSREFS
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Cf. A000110, A051131.
Sequence in context: A033995 A013917 A056893 this_sequence A078749 A046062 A096263
Adjacent sequences: A051127 A051128 A051129 this_sequence A051131 A051132 A051133
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KEYWORD
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hard,nonn,nice
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AUTHOR
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Ignacio Larrosa Canestro (ignacio.larrosa(AT)eresmas.net)
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