A179553 - OEIS

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A179553

Decimal expansion of the surface area of pentagonal pyramid with edge length 1.

11

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

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OFFSET

1,1

COMMENTS

Pentagonal pyramid: 6 faces, 6 vertices, and 10 edges.

LINKS

Table of n, a(n) for n=1..105.

Wolfram Alpha, Johnson solid 2

Index entries for algebraic numbers, degree 8

FORMULA

Digits of sqrt(5/2*(10+sqrt(5)+sqrt(75+30sqrt(5))))/2.

EXAMPLE

3.885540910050063539668319904270950058085880737273174114276853431338785...

MATHEMATICA

RealDigits[N[Sqrt[5/2*(10+Sqrt[5]+Sqrt[75+30*Sqrt[5]])]/2, 200]]

CROSSREFS

Cf. A001622, A010527, A102208, A179290, A179292, A179294, A179449, A179450, A179451, A179452, A179552.

Sequence in context: A371941 A232182 A118817 * A157471 A288094 A131596

Adjacent sequences: A179550 A179551 A179552 * A179554 A179555 A179556

KEYWORD

nonn,cons,easy

AUTHOR

Vladimir Joseph Stephan Orlovsky, Jul 19 2010

STATUS

approved