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A173867 Largest prime < n-th Catalan number. 1
3, 13, 41, 131, 421, 1429, 4861, 16787, 58771, 208009, 742897, 2674429, 9694843, 35357657, 129644783, 477638699, 1767263171, 6564120403, 24466266973, 91482563633, 343059613639, 1289904147227, 4861946401451, 18367353072143 (list; graph; refs; listen; history; text; internal format)
OFFSET

3,1

LINKS

Table of n, a(n) for n=3..26.

MATHEMATICA

PrimePrev[n_] := Module[{k=n-1}, While[ !PrimeQ[k], k--]; k]; f[n_] := (2n)!/n!/(n+1)!; Table[PrimePrev[f[n]], {n, 40}]

NextPrime[#, -1]&/@CatalanNumber[Range[3, 30]] (* Harvey P. Dale, Sep 19 2012 *)

CROSSREFS

Cf. A000108.

Sequence in context: A049167 A241527 A234387 * A121162 A146018 A145946

Adjacent sequences: A173864 A173865 A173866 * A173868 A173869 A173870

KEYWORD

nonn

AUTHOR

Vladimir Joseph Stephan Orlovsky, Feb 28 2010

STATUS

approved

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Last modified January 29 20:56 EST 2023. Contains 359926 sequences. (Running on oeis4.)