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A382008
Decimal expansion of the isoperimetric quotient of a rhombic triacontahedron.
1
8, 8, 7, 2, 0, 0, 0, 0, 2, 5, 4, 8, 0, 2, 0, 8, 5, 8, 0, 0, 5, 4, 4, 4, 0, 9, 3, 9, 8, 4, 2, 6, 0, 0, 3, 7, 8, 5, 7, 3, 8, 9, 8, 6, 5, 7, 2, 1, 1, 6, 0, 9, 3, 7, 4, 6, 2, 6, 4, 0, 6, 8, 0, 7, 2, 0, 5, 1, 8, 3, 1, 2, 8, 7, 9, 4, 4, 0, 4, 1, 3, 4, 9, 0, 6, 8, 0, 8, 0, 4
OFFSET
0,1
COMMENTS
For the definition of isoperimetric quotient of a solid, references and links, see A381684.
FORMULA
Equals 36*Pi*A344172^2/(A344171^3).
Equals Pi*(2 + sqrt(5))/15 = A000796*A098317/15.
EXAMPLE
0.88720000254802085800544409398426003785738986572116...
MATHEMATICA
First[RealDigits[Pi*(2 + Sqrt[5])/15, 10, 100]]
CROSSREFS
Cf. A344171 (surface area), A344172 (volume).
Sequence in context: A248570 A242051 A263030 * A217171 A357145 A197381
KEYWORD
nonn,cons,easy
AUTHOR
Paolo Xausa, Mar 20 2025
STATUS
approved