login
A323098
Decimal expansion of edge length of a regular pentagon with area 1.
0
7, 6, 2, 3, 8, 7, 0, 5, 5, 5, 0, 6, 7, 7, 3, 8, 7, 4, 4, 9, 8, 4, 0, 2, 6, 8, 2, 1, 5, 8, 8, 4, 9, 2, 2, 6, 0, 9, 6, 3, 2, 1, 4, 2, 1, 2, 8, 0, 9, 2, 8, 2, 7, 9, 8, 6, 9, 1, 4, 9, 8, 4, 9, 6, 3, 4, 6, 9, 4, 8, 3, 7, 5, 1, 0, 8, 7, 0, 7, 2, 1, 3, 2, 8, 9, 4, 8
OFFSET
0,1
FORMULA
Equals sqrt(1/A102771) = 2/(25 + 10*sqrt(5))^(1/4).
EXAMPLE
0.7623870555067738744984026821...
MATHEMATICA
RealDigits[(2)/(25 + 10*Sqrt[5])^(1/4), 10, 100][[1]] (* Metin Sariyar, Oct 26 2019 *)
PROG
(PARI) default(realprecision, 110); 2/(25 + 10*sqrt(5))^(1/4)
CROSSREFS
Cf. A102771, A154605 (the edge length of an equilateral triangle).
Sequence in context: A138096 A258010 A011102 * A068469 A276459 A181152
KEYWORD
cons,nonn
AUTHOR
Jinyuan Wang, Oct 26 2019
STATUS
approved