Smallest prime > n-th Catalan number.

Terms

a(0) =2a(1) =3a(2) =7a(3) =17a(4) =43a(5) =137a(6) =431a(7) =1433a(8) =4871a(9) =16811a(10) =58787a(11) =208037a(12) =742909a(13) =2674453a(14) =9694849a(15) =35357711a(16) =129644831a(17) =477638741a(18) =1767263209a(19) =6564120463a(20) =24466267027a(21) =91482563651a(22) =343059613667