A092840 Primes in A001003.

3, 11, 197, 103049

Offset: 1

Author

Eric W. Weisstein, Mar 07 2004

Keywords

• nonn

Comments

The next term is too large to include.

Links

• Harry J. Smith, Table of n, a(n) for n = 1..5
• Eric Weisstein's World of Mathematics, Super Catalan Number

Crossrefs

Cf. A001003, A092839.

Programs

PARI

s(m)= { if (m==1, return(a1)); if (m==2, return(a2)); r = (3*(2*m - 3)*a2 - (m - 3)*a1)/m; a1=a2; a2=r; return(r); }
{ a1=1; a2=1; n=0; for (m=1, 300, a=s(m); if (isprime(a), n++; print1(a, ", "))); } \\ Harry J. Smith, Jun 21 2009