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Search: id:A117315
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| A117315 |
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Primes within +1 or -1 of a central binomial coefficient C(2n,n). |
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+0
1
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| 2, 3, 5, 7, 19, 71, 251, 3433, 48619, 2704157, 155117519, 35345263801, 2104098963721, 30067266499541039, 6892620648693261354601, 6637553085023755473070799, 410795449442059149332177041
(list; graph; listen)
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OFFSET
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0,1
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EXAMPLE
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2 = C(0,0) + 1;
19 = C(6,3) - 1.
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MATHEMATICA
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b = Binomial[2#, # ] & /@ Range@60; Select[ Sort@ Join[b - 1, b, b + 1], PrimeQ@ # &] - Robert G. Wilson v (rgwv(at)rgwv.com), Apr 27 2006
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CROSSREFS
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Cf. A000040, A000984.
Adjacent sequences: A117312 A117313 A117314 this_sequence A117316 A117317 A117318
Sequence in context: A048419 A087562 A065724 this_sequence A048420 A048405 A024768
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KEYWORD
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easy,nonn
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AUTHOR
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Greg Huber (huber(AT)alum.mit.edu), Apr 24 2006
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EXTENSIONS
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More terms from Robert G. Wilson v (rgwv(at)rgwv.com), Apr 27 2006
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