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A246729 Decimal expansion of r_8, the 8th smallest radius < 1 for which a compact packing of the plane exists, with disks of radius 1 and r_8. 7
5, 4, 5, 1, 5, 1, 0, 4, 2, 1, 2, 2, 5, 7, 2, 6, 8, 7, 5, 9, 3, 8, 0, 7, 7, 1, 8, 3, 3, 7, 3, 4, 8, 6, 9, 6, 3, 8, 4, 3, 5, 5, 5, 7, 4, 9, 7, 3, 4, 6, 4, 7, 5, 2, 9, 2, 5, 3, 5, 6, 8, 1, 6, 5, 2, 1, 4, 4, 4, 1, 2, 6, 8, 7, 7, 7, 5, 2, 2, 9, 5, 9, 9, 2, 4, 7, 9, 4, 4, 6, 4, 6, 6, 2, 5, 6, 2, 7, 8, 9, 5 (list; constant; graph; refs; listen; history; text; internal format)
OFFSET

0,1

LINKS

Table of n, a(n) for n=0..100.

Steven R. Finch, Errata and Addenda to Mathematical Constants, p. 62.

Steven R. Finch, Errata and Addenda to Mathematical Constants, January 22, 2016. [Cached copy, with permission of the author]

FORMULA

3rd root of x^8 - 8x^7 - 44x^6 - 232x^5 - 482x^4 - 24x^3 + 388x^2 - 120x + 9.

EXAMPLE

0.5451510421225726875938077183373486963843555749734647529253568...

MATHEMATICA

RealDigits[Root[x^8 - 8x^7 - 44x^6 - 232x^5 - 482x^4 - 24x^3 + 388x^2 - 120x + 9, x, 3], 10, 101] // First

CROSSREFS

Cf. A246723 (r_1), A246724 (r_2), A246725 (r_3), A246726 (r_4), A246727 (r_5), A002193 (r_6 = sqrt(2)-1), A246728 (r_7), A246730 (r_9).

Sequence in context: A204372 A279918 A273986 * A293557 A123587 A018840

Adjacent sequences:  A246726 A246727 A246728 * A246730 A246731 A246732

KEYWORD

nonn,cons,easy

AUTHOR

Jean-Fran├žois Alcover, Sep 02 2014

STATUS

approved

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Last modified October 18 00:03 EDT 2019. Contains 328135 sequences. (Running on oeis4.)