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A377274
Decimal expansion of the surface area of a truncated tetrahedron with unit edge length.
2
1, 2, 1, 2, 4, 3, 5, 5, 6, 5, 2, 9, 8, 2, 1, 4, 1, 0, 5, 4, 6, 9, 2, 1, 2, 4, 3, 9, 0, 5, 4, 1, 1, 0, 6, 5, 6, 8, 5, 9, 9, 6, 3, 6, 7, 7, 6, 6, 7, 2, 6, 6, 4, 3, 9, 6, 3, 9, 0, 6, 4, 8, 8, 5, 6, 1, 6, 3, 5, 3, 1, 1, 1, 8, 3, 6, 1, 6, 0, 0, 2, 5, 9, 5, 6, 8, 0, 2, 3, 3
OFFSET
2,2
LINKS
Eric Weisstein's World of Mathematics, Truncated Tetrahedron.
FORMULA
Equals 7*sqrt(3) = 7*A002194.
EXAMPLE
12.12435565298214105469212439054110656859963677667...
MATHEMATICA
First[RealDigits[7*Sqrt[3], 10, 100]] (* or *)
First[RealDigits[PolyhedronData["TruncatedTetrahedron", "SurfaceArea"], 10, 100]]
CROSSREFS
Cf. A377275 (volume), A377276 (circumradius), A093577 (midradius), A377277 (Dehn invariant).
Cf. A002194 (analogous for a regular tetrahedron).
Sequence in context: A100461 A302655 A316997 * A323465 A364780 A124904
KEYWORD
nonn,cons,easy
AUTHOR
Paolo Xausa, Oct 23 2024
STATUS
approved