1,1

prime(2^2)+prime(2^1) + 1 = 11 = prime.

(PARI) f(n)= for(x=1, n, y=prime(2^x)+ prime(2^(x-1))+1; if(isprime(y), print1(y", ")))

Sequence in context: A142015 A123039 A163775 this_sequence A155634 A054461 A003367

Adjacent sequences: A092241 A092242 A092243 this_sequence A092245 A092246 A092247

hard,nonn

Cino Hilliard (hillcino368(AT)gmail.com), Feb 20 2004