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 A131636 List of impossible triples {V, F, E} that satisfy Euler's equation V=E-F+2 but do not correspond to polyhedra. 0
 0, 2, 0, 0, 3, 1, 1, 1, 0, 1, 2, 1, 1, 3, 2, 2, 0, 0, 2, 1, 1, 2, 2, 2, 2, 3, 3, 3, 0, 1, 3, 1, 2, 3, 2, 3, 3, 3, 4 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS This set of triples seems to be a finite set of "graphs" that are Euler solutions but not polyhedra. LINKS FORMULA If V<4 and F<4 and E<7 and V=E-F+2: a(n) = {V(m),F(m),E(m)} MATHEMATICA a = Delete[Union[Flatten[Table[If[v + f - 2 - e0 == 0, {v, f, e0}, {}], {v, 0, 3}, {f, 0, 3}, {e0, 0, 6}], 2]], 1]; Flatten[a] CROSSREFS Cf. A130840. Sequence in context: A303908 A082660 A134673 * A188023 A077888 A319668 Adjacent sequences:  A131633 A131634 A131635 * A131637 A131638 A131639 KEYWORD nonn AUTHOR Roger L. Bagula, Sep 05 2007 EXTENSIONS Partially edited by N. J. A. Sloane, Sep 14 2007. STATUS approved

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Last modified September 27 07:44 EDT 2021. Contains 347673 sequences. (Running on oeis4.)