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Search: id:A121307
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| 8, 20, 44, 50, 68, 92, 110, 116, 125, 164, 170, 188, 212, 230, 236, 242, 275, 284, 290, 332, 356, 374, 404, 410, 425, 428, 452, 470, 506, 524, 530, 548, 575, 578, 590, 596
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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 3-almost primes. For the Eisenstein primes see A055664. - njas, Feb 06 2008.
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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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FORMULA
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{a(n)} = {p*q*r: p and q and r elements of A007645} = {p*q*r: p and q and r of form 3*m^2 * n^2 for integers m, n}
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CROSSREFS
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Cf. A003627, A014612, A112770.
Adjacent sequences: A121304 A121305 A121306 this_sequence A121308 A121309 A121310
Sequence in context: A073607 A086062 A006416 this_sequence A086169 A107816 A036835
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KEYWORD
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easy,nonn
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AUTHOR
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Jonathan Vos Post (jvospost2(AT)yahoo.com), Sep 05 2006
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EXTENSIONS
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Definition corrected by njas, Feb 06 2008
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