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Search: id:A051131
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| 2, 5, 877, 27644437, 35742549198872617291353508656626642567, 359334085968622831041960188598043661065388726959079837
(list; graph; listen)
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OFFSET
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1,1
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REFERENCES
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Bell, E. T. "Exponential Numbers." Amer. Math. Monthly 41, 411-419, 1934.
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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
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EXAMPLE
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Bell(2)=2 and Bell(3)=5 are primes, Bell(4)..Bell(6) are composite, Bell(7)=877 is prime.
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CROSSREFS
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Cf. A000110, A051130.
Sequence in context: A065588 A131748 A078748 this_sequence A119748 A101341 A079014
Adjacent sequences: A051128 A051129 A051130 this_sequence A051132 A051133 A051134
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KEYWORD
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nonn
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AUTHOR
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Ignacio Larrosa Canestro (ignacio.larrosa(AT)eresmas.net)
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EXTENSIONS
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The next term is too large to include. See A051330.
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