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A173948
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a(n) = denominator of 8 Catalan + Pi^2 - Zeta[2, (4 n + 1)/4]
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11
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1, 1, 25, 2025, 342225, 98903025, 4846248225, 121156205625, 101892368930625, 12328976640605625, 16878369020989100625, 28372538324282678150625, 28372538324282678150625, 1390254377889851229380625, 3905224547492592103330175625, 1409786061644825749302193400625, 5245813935380396613153461643725625
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OFFSET
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0,3
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COMMENTS
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For n>=2 numbers in this sequence are divisable by 25.
For n>=7 numbers in this sequence are divisable by 25^2.
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LINKS
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Table of n, a(n) for n=0..16.
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MATHEMATICA
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Table[Denominator[RootApproximant[N[8 Catalan + \[Pi]^2 - Zeta[2, (4 k + 1)/4], 100], 1]], {k, 0, 20}]
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CROSSREFS
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Cf. A120268, A173945, A173947
Sequence in context: A197671 A051112 A061843 * A197408 A197430 A195272
Adjacent sequences: A173945 A173946 A173947 * A173949 A173950 A173951
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KEYWORD
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frac,nonn
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AUTHOR
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Artur Jasinski, Mar 03 2010
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STATUS
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approved
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