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

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: A102639 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

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Last modified August 10 03:18 EDT 2022. Contains 356029 sequences. (Running on oeis4.)