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URL: https://oeis.org/A384059

⇱ A384059 - OEIS


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A384059
Decimal expansion of the circumradius of a regular pentagonal prism of edge length 1.
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
0,1
FORMULA
Equals (1/2)*sqrt(3 + 2/sqrt(5)).
Minimal polynomial: 80*x^4 - 120*x^2 + 41. - Stefano Spezia, May 18 2025
EXAMPLE
0.98671515532598310...
MATHEMATICA
RealDigits[1/2 * Sqrt(3 + 2/Sqrt(5)), 10, 100, -1][[1]]
CROSSREFS
Cf. A102771 (volume), A300074 (midradius), A384036 (surface area).
Sequence in context: A155920 A082124 A393785 * A132721 A309948 A086053
KEYWORD
nonn,cons
AUTHOR
Kritsada Moomuang, May 18 2025
STATUS
approved