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 A117315 Primes within +1 or -1 of a central binomial coefficient C(2n,n). 1
 2, 3, 5, 7, 19, 71, 251, 3433, 48619, 2704157, 155117519, 35345263801, 2104098963721, 30067266499541039, 6892620648693261354601, 6637553085023755473070799, 410795449442059149332177041, 399608854866744452032002440111, 1520803477811874490019821888415218657 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,1 LINKS Harvey P. Dale, Table of n, a(n) for n = 0..47 EXAMPLE 2 = C(0,0) + 1; 19 = C(6,3) - 1. MATHEMATICA b = Binomial[2#, # ] & /@ Range@60; Select[ Sort@ Join[b - 1, b, b + 1], PrimeQ@ # &] - Robert G. Wilson v, Apr 27 2006 Select[Flatten[Table[Binomial[2n, n]+{-1, 1}, {n, 0, 50}]], PrimeQ] (* Harvey P. Dale, Apr 08 2019 *) CROSSREFS Cf. A000040, A000984. Sequence in context: A235620 A289756 A236303 * A158473 A048420 A048405 Adjacent sequences:  A117312 A117313 A117314 * A117316 A117317 A117318 KEYWORD easy,nonn AUTHOR Greg Huber, Apr 24 2006 EXTENSIONS More terms from Robert G. Wilson v, Apr 27 2006 More terms from Harvey P. Dale, Apr 08 2019 STATUS approved

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Last modified June 22 19:28 EDT 2021. Contains 345388 sequences. (Running on oeis4.)