A384059 Decimal expansion of the circumradius of a regular pentagonal prism of edge length 1.
9, 8, 6, 7, 1, 5, 1, 5, 5, 3, 2, 5, 9, 8, 3, 1, 0, 7, 3, 2, 0, 7, 0, 0, 0, 5, 5, 8, 4, 0, 6, 6, 8, 9, 1, 7, 8, 7, 2, 8, 5, 0, 4, 5, 2, 2, 3, 2, 0, 3, 5, 0, 7, 3, 7, 8, 6, 4, 3, 1, 5, 5, 2, 4, 8, 6, 1, 9, 6, 1, 0, 4, 0, 5, 4, 5, 3, 8, 1, 0, 3, 3, 0, 5, 7, 9, 1
Offset: 0
Examples
0.98671515532598310...
Programs
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Mathematica
RealDigits[1/2 * Sqrt(3 + 2/Sqrt(5)), 10, 100, -1][[1]]
Formula
Equals (1/2)*sqrt(3 + 2/sqrt(5)).
Minimal polynomial: 80*x^4 - 120*x^2 + 41. - Stefano Spezia, May 18 2025