1,1

Sum of two positive cubes x^3+y^3 such that both x+y and x^2-x*y+y^2 are primes.

Zak Seidov, Table of n, a(n) for n=1..1356

a(2)=35 because 3^3+2^3=5*7, a(5)=133=5^3+2^3=(5+2)*(5^2-5*2+2^2)=7*19.

Cf. A003325, A046388, A001358, A085367.

Sequence in context: A067960 A119757 A003865 this_sequence A033566 A022275 A071398

Adjacent sequences: A085363 A085364 A085365 this_sequence A085367 A085368 A085369

nonn

Hugo Pfoertner (hugo(AT)pfoertner.org), Jun 25 2003