login
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
OFFSET
0,1
LINKS
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
Sequence in context: A235620 A289756 A236303 * A158473 A048420 A048405
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