A298740 - OEIS

A298740

Decimal expansion of (1/2)(1 + sqrt(1 + 4*sqrt(2))).

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

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OFFSET

1,2

COMMENTS

Positive zero of x^2 - x - sqrt(2).

LINKS

Clark Kimberling, Table of n, a(n) for n = 1..10000

Index entries for algebraic numbers, degree 4.

FORMULA

Minimal polynomial: x^4 - 2*x^3 + x^2 - 2. - Amiram Eldar, May 28 2026

EXAMPLE

1.7900440156727579847...