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%I #13 Sep 08 2022 08:46:17
%S 0,0,1,3,6,13,32,82,226,651,1939,5946,18637,59736,194898,645742,
%T 2167325,7359262,25237989,87325031,304549332,1069685013,3781189896,
%U 13443608964,48049822995,172568075048,622514907195,2254799747130
%N Number of primes <= n-th Catalan number.
%F a(n) = A000720(A000108(n)). - _Michel Marcus_, Nov 10 2016
%t Table[PrimePi[CatalanNumber[n]], {n, 0, 27}]
%o (Magma) [#PrimesUpTo(Catalan(n)): n in [0..18]];
%Y Cf. A000108, A054782, A277062, A277063.
%K nonn
%O 0,4
%A _Vincenzo Librandi_, Nov 10 2016
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