A387917 - OEIS

A387917

Decimal expansion of 5*sqrt(5)/3.

3, 7, 2, 6, 7, 7, 9, 9, 6, 2, 4, 9, 9, 6, 4, 9, 4, 9, 4, 0, 1, 5, 2, 8, 9, 4, 4, 7, 8, 8, 5, 4, 6, 0, 3, 9, 2, 4, 0, 1, 0, 3, 0, 5, 9, 9, 3, 5, 2, 5, 4, 2, 8, 7, 3, 7, 8, 4, 8, 2, 8, 7, 4, 2, 3, 5, 0, 8, 6, 8, 2, 0, 9, 3, 9, 6, 3, 4, 1, 4, 9, 9, 0, 2, 4, 0, 2, 4, 0, 1, 3, 9, 6, 4, 6, 3, 7, 1, 2, 4, 9, 4, 9, 1, 8

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OFFSET

1,1

LINKS

Table of n, a(n) for n=1..105.

Hideyuki Ohtsuka, Problem B-1373, Elementary problems and solutions, The Fibonacci Quarterly, Vol. 63, No. 4 (2025), p. 754.

Index entries for algebraic numbers, degree 2.

FORMULA

Equals 5 * A208899.

Equals 100 / A344171.

Equals Product_{k>=3} ((Fibonacci(k)+1)/(Fibonacci(k)-1))^((-1)^(k*(k+1)/2)) (Ohtsuka, 2025).

EXAMPLE