A384036 Decimal expansion of the surface area of a regular pentagonal prism of edge length 1.

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

Offset: 1

Author

Kritsada Moomuang, May 17 2025

Keywords

• nonn
• cons

Examples

			8.4409548011779338455...
		

Crossrefs

Cf. A178809.

Cf. A102771 (volume), A300074 (midradius), A384059 (circumradius).

Programs

Mathematica

RealDigits[5 + 1/2 * Sqrt(25 + 10 * Sqrt(5)), 10, 100, 0][[1]]

Formula

Equals 5 + (1/2)*sqrt(25 + 10*sqrt(5)).

Minimal polynomial: 16*x^4 - 320*x^3 + 2200*x^2 - 6000*x + 5125. - Stefano Spezia, May 17 2025