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A055745
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Squarefree numbers not of form ab + bc + ca for 1<=a<=b<=c (probably the list is complete).
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2
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1, 2, 6, 10, 22, 30, 42, 58, 70, 78, 102, 130, 190, 210, 330, 462
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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REFERENCES
| Maohua Le, A note on positive integer solutions of the equation xy+yz+zx=n, Publ. Math. Debrecen 52 (1998) 159-165; Math. Rev. 98j:11016.
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LINKS
| J. Borwein and K.-K. S. Choi, On the representations of xy+yz+zx, Experimental Mathematics, 9 (2000), 153-158 (dvi, ps).
Experimental Mathematics, Home Page
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CROSSREFS
| Cf. A034168, A025052, A034169.
Sequence in context: A077064 A080715 A034168 * A167512 A055895 A125527
Adjacent sequences: A055742 A055743 A055744 * A055746 A055747 A055748
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KEYWORD
| nonn,fini,nice
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com).
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