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A092839
Indices of primes in A001003.
4
3, 4, 6, 10, 216
OFFSET
1,1
COMMENTS
a(6), if it exists, is > 1.5*10^6. - Robert Price, Apr 16 2014
LINKS
Eric Weisstein's World of Mathematics, Super Catalan Number
Eric Weisstein's World of Mathematics, Integer Sequence Primes
PROG
(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(m, ", "))); } \\ Harry J. Smith, Jun 21 2009
CROSSREFS
Sequence in context: A103016 A061032 A091424 * A185874 A320688 A352734
KEYWORD
nonn,more
AUTHOR
Eric W. Weisstein, Mar 07 2004
STATUS
approved