A173867 Largest prime < n-th Catalan number.

3, 13, 41, 131, 421, 1429, 4861, 16787, 58771, 208009, 742897, 2674429, 9694843, 35357657, 129644783, 477638699, 1767263171, 6564120403, 24466266973, 91482563633, 343059613639, 1289904147227, 4861946401451, 18367353072143

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