OFFSET
1,2
COMMENTS
The sum of the first 30 Catalan numbers, 1 + 2 + 5 + ... + 3814986502092304 = 5175497420902740, is divisible by 30, so 30 is a term.
No more terms < 5*10^7. - Lars Blomberg, Nov 07 2011
LINKS
Eric Weisstein's World of Mathematics, Catalan Number
MATHEMATICA
Module[{nn=40000, lst}, lst=Thread[{Range[nn], Accumulate[CatalanNumber[Range[nn]]]}]; Position[ lst, _?(Mod[#[[2]], #[[1]]]==0&), 1, Heads->False]]//Flatten (* The program generates the first 5 terms of the sequence. *) (* Harvey P. Dale, Jun 18 2024 *)
CROSSREFS
KEYWORD
hard,more,nonn
AUTHOR
Ryan Propper, Jan 07 2008
STATUS
approved