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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: A019744 A102639 A118817 * A157471 A131596 A140975

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 May 25 17:34 EDT 2013. Contains 225647 sequences.