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A246723 Decimal expansion of r_1, the smallest radius for which a compact packing of the plane exists, with disks of radius 1 and r_1. 7
1, 0, 1, 0, 2, 0, 5, 1, 4, 4, 3, 3, 6, 4, 3, 8, 0, 3, 6, 0, 5, 4, 3, 1, 8, 5, 0, 5, 8, 8, 2, 1, 7, 2, 1, 6, 0, 6, 8, 1, 0, 5, 0, 3, 8, 6, 8, 6, 6, 5, 9, 7, 4, 3, 1, 3, 4, 6, 1, 4, 8, 6, 5, 4, 9, 8, 0, 7, 9, 2, 4, 5, 0, 8, 5, 3, 6, 9, 9, 4, 6, 9, 2, 0, 2, 8, 1, 1, 3, 3, 7, 9, 0, 7, 1, 9, 5, 3, 0, 3, 6, 2, 8, 1 (list; constant; graph; refs; listen; history; text; internal format)
OFFSET

0,5

LINKS

Table of n, a(n) for n=0..103.

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

FORMULA

5 - 2*sqrt(6).

EXAMPLE

0.101020514433643803605431850588217216068105038686659743...

MATHEMATICA

RealDigits[5 - 2*Sqrt[6], 10, 104] // First

CROSSREFS

Cf. A246724 (r_2), A246725 (r_3), A246726 (r_4), A246727 (r_5), A002193 (r_6 = sqrt(2)-1), A246728 (r_7), A246729 (r_8), A246730 (r_9).

Sequence in context: A327806 A319683 A294137 * A307438 A198926 A243998

Adjacent sequences:  A246720 A246721 A246722 * A246724 A246725 A246726

KEYWORD

nonn,cons,easy

AUTHOR

Jean-Fran├žois Alcover, Sep 02 2014

STATUS

approved

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Last modified September 29 12:15 EDT 2020. Contains 337431 sequences. (Running on oeis4.)