A377795 - OEIS

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A377795

Decimal expansion of the midradius of a (small) rhombicosidodecahedron with unit edge length.

0

2, 1, 7, 6, 2, 5, 0, 8, 9, 9, 4, 8, 2, 8, 2, 1, 5, 1, 1, 1, 0, 0, 0, 5, 2, 8, 6, 5, 9, 9, 7, 7, 6, 7, 8, 8, 0, 1, 9, 8, 0, 7, 3, 1, 9, 1, 5, 8, 9, 3, 2, 9, 9, 4, 7, 2, 3, 0, 1, 0, 1, 7, 4, 5, 9, 2, 4, 8, 3, 3, 2, 0, 0, 9, 7, 2, 0, 7, 6, 8, 0, 9, 5, 0, 7, 6, 7, 9, 1, 8

(list; constant; graph; refs; listen; history; text; internal format)

OFFSET

1,1

LINKS

Table of n, a(n) for n=1..90.

Eric Weisstein's World of Mathematics, Small Rhombicosidodecahedron.

Wikipedia, Rhombicosidodecahedron.

FORMULA

Equals sqrt(5/2 + sqrt(5)) = sqrt(5/2 + A002163).

EXAMPLE

2.1762508994828215111000528659977678801980731915893...

MATHEMATICA

First[RealDigits[Sqrt[5/2 + Sqrt[5]], 10, 100]] (* or *)

First[RealDigits[PolyhedronData["Rhombicosidodecahedron", "Midradius"], 10, 100]]

CROSSREFS

Cf. A344149 (surface area), A185093 (volume), A179592 (circumradius), A377606 (Dehn invariant, negated).

Sequence in context: A135895 A039814 A178120 * A180568 A373050 A248950

Adjacent sequences: A377792 A377793 A377794 * A377796 A377797 A377798

KEYWORD

nonn,cons,easy,new

AUTHOR

Paolo Xausa, Nov 08 2024

STATUS

approved