A377787 Decimal expansion of 30*arctan(2).

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

Offset

2,1

Comments

Dehn invariant of the unit truncated icosahedron and Dehn invariant (negated) of the unit regular dodecahedron.

Links

Table of n, a(n) for n=2..101.

Eric Weisstein's World of Mathematics, Dehn Invariant.

Eric Weisstein's World of Mathematics, Regular Dodecahedron.

Eric Weisstein's World of Mathematics, Truncated Icosahedron.

Index entries for transcendental numbers

Example

33.214461533822715090511963805356111202101429362043...

Mathematica

First[RealDigits[30 ArcTan[2], 10, 100]]
First[RealDigits[PolyhedronData["Dodecahedron", "DehnInvariant"], 10, 100]]
First[RealDigits[PolyhedronData["TruncatedIcosahedron", "DehnInvariant"], 10, 100]]

Prog

(PARI) 30*atan(2) \\ Charles R Greathouse IV, Nov 20 2024

Crossrefs

Sequence in context: A283755 A038766 A080993 * A140259 A175644 A102905

Adjacent sequences: A377784 A377785 A377786 * A377788 A377789 A377790

Keyword

nonn,cons

Author

Eric W. Weisstein, Nov 07 2024

Status

approved