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Search: id:A112770
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| 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
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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It would be incorrect to call these Eisenstein semiprimes. For the Eisenstein primes see A055664. - N. J. A. Sloane (njas(AT)research.att.com), Feb 06 2008. For
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REFERENCES
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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.
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LINKS
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Eric Weisstein's World of Mathematics, Eisenstein Integer.
Eric Weisstein's World of Mathematics, Eisenstein Prime.
Eric Weisstein's World of Mathematics, Semiprime.
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FORMULA
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{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}.
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CROSSREFS
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Cf. A001358, A003627.
Sequence in context: A111927 A109885 A054211 this_sequence A112774 A008178 A009891
Adjacent sequences: A112767 A112768 A112769 this_sequence A112771 A112772 A112773
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KEYWORD
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easy,nonn
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AUTHOR
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Jonathan Vos Post (jvospost3(AT)gmail.com) and Ray Chandler (rayjchandler(AT)sbcglobal.net), Oct 15 2005
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EXTENSIONS
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Definition corrected by N. J. A. Sloane (njas(AT)research.att.com), Feb 06 2008
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