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Search: a208899 -id:a208899
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Numerators of partial sums of a series for sqrt(5)/3.
+10
2
1, 3, 21, 17, 99, 2223, 12039, 56763, 59337, 286961, 7358781, 36088473, 183146521, 181066401, 36534213, 4535753121, 22798981683, 113528187171, 113891192583, 568042152363, 14228623114839, 71035463999307, 355598139789279
CROSSREFS
Cf. A124398 (denominators), A208899 (sqrt(5)/3).
Denominators of partial sums of a series for sqrt(5)/3.
+10
2
1, 5, 25, 25, 125, 3125, 15625, 78125, 78125, 390625, 9765625, 48828125, 244140625, 244140625, 48828125, 6103515625, 30517578125, 152587890625, 152587890625, 762939453125, 19073486328125, 95367431640625, 476837158203125
CROSSREFS
Cf. A124397 (numerators), A208899 (sqrt(5)/3).
Decimal expansion of the surface area of a tetrakis hexahedron with unit shorter edge length.
+10
0
1, 1, 9, 2, 5, 6, 9, 5, 8, 7, 9, 9, 9, 8, 8, 7, 8, 3, 8, 0, 8, 4, 8, 9, 2, 6, 2, 3, 3, 2, 3, 3, 4, 7, 3, 2, 5, 5, 6, 8, 3, 2, 9, 7, 9, 1, 7, 9, 2, 8, 1, 3, 7, 1, 9, 6, 1, 1, 1, 4, 5, 1, 9, 7, 5, 5, 2, 2, 7, 7, 8, 2, 7, 0, 0, 6, 8, 2, 9, 2, 7, 9, 6, 8, 7, 6, 8, 7, 6, 8
FORMULA
Equals (16/3)*sqrt(5) = (16/3)*A002163 = 16*A208899.
CROSSREFS

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