A112770 Products of pairs of terms from A003627.

4, 10, 22, 25, 34, 46, 55, 58, 82, 85, 94, 106, 115, 118, 121, 142, 145, 166, 178, 187, 202, 205, 214, 226, 235, 253, 262, 265, 274, 289, 295, 298, 319, 334, 346, 355, 358, 382, 391, 394, 415, 445, 451, 454, 466, 478, 493, 502, 505, 514, 517, 526, 529, 535

Offset: 1

Author

Jonathan Vos Post and Ray Chandler, Oct 15 2005

Keywords

• easy
• nonn

Comments

It would be incorrect to call these Eisenstein semiprimes. For the Eisenstein primes see A055664. - N. J. A. Sloane, Feb 06 2008. For

References

• Conway, J. H. and Guy, R. K., The Book of Numbers. New York: Springer-Verlag, pp. 220-223, 1996.
• Wagon, S. "Eisenstein Primes." Section 9.8 in Mathematica in Action. New York: W. H. Freeman, pp. 319-323, 1991.

Links

• Eric Weisstein's World of Mathematics, Eisenstein Integer.
• Eric Weisstein's World of Mathematics, Eisenstein Prime.
• Eric Weisstein's World of Mathematics, Semiprime.

Crossrefs

Cf. A001358, A003627.

Formula

{a(n)} = {p*q: p and q both elements of A007645} = {p*q: p and q both of form 3*m^2 * n^2 for integers m, n}.

Extensions

Definition corrected by N. J. A. Sloane, Feb 06 2008