2,1

Table of n, a(n) for n=2..77.

prime(prime(3)) - prime(prime(2)) = 6. 6/2 = 3 = first term

prime(prime(4)) - prime(prime(3)) = 6. 6/2 = 3 = second term

(PARI) g(n, m) = for(x=1, n, y=prime(prime(x+m)) - prime(prime(x)); if(y%2==0&isprime(y/2), print1(y\2", ")))

Sequence in context: A079316 A106481 A106477 * A324866 A290673 A290418

Adjacent sequences: A098040 A098041 A098042 * A098044 A098045 A098046

easy,nonn

Cino Hilliard, Sep 10 2004

approved