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URL: https://oeis.org/A386741

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A386741
Decimal expansion of the volume of a hebesphenomegacorona with unit edges.
12
2, 9, 1, 2, 9, 1, 0, 4, 1, 4, 5, 4, 0, 2, 0, 9, 1, 6, 6, 0, 4, 2, 8, 0, 0, 9, 1, 0, 0, 8, 3, 3, 2, 0, 3, 6, 3, 8, 3, 6, 1, 5, 3, 0, 3, 7, 7, 5, 1, 0, 7, 9, 4, 3, 4, 4, 4, 1, 5, 8, 7, 4, 7, 3, 9, 0, 7, 1, 7, 5, 7, 4, 5, 2, 2, 0, 4, 9, 4, 7, 6, 8, 5, 7, 6, 3, 8, 9, 7, 5
OFFSET
1,1
COMMENTS
The hebesphenomegacorona is Johnson solid J_89.
FORMULA
Equals the largest real root of 47330370277129322496*x^20 - 722445512980071186432*x^18 + 3596480447590271287296*x^16 - 8432333285523990773760*x^14 + 8973584611317745975296*x^12 - 3065290664181478981632*x^10 + 366229890219212144640*x^8 - 8337259437908852736*x^6 - 22211277300912896*x^4 + 132615435213216*x^2 + 2693461945329.
EXAMPLE
2.912910414540209166042800910083320363836153037751...
MATHEMATICA
First[RealDigits[Root[47330370277129322496*#^20 - 722445512980071186432*#^18 + 3596480447590271287296*#^16 - 8432333285523990773760*#^14 + 8973584611317745975296*#^12 - 3065290664181478981632*#^10 + 366229890219212144640*#^8 - 8337259437908852736*#^6 - 22211277300912896*#^4 + 132615435213216*#^2 + 2693461945329 &, 8], 10, 100]] (* or *)
First[RealDigits[PolyhedronData["J89", "Volume"], 10, 100]]
CROSSREFS
Cf. A386742 (surface area).
Sequence in context: A199381 A083649 A073009 * A011064 A086773 A176124
KEYWORD
nonn,cons,easy
AUTHOR
Paolo Xausa, Aug 01 2025
STATUS
approved