

A173948


a(n) = denominator of 8 Catalan + Pi^2  Zeta[2, (4 n + 1)/4]


11



1, 1, 25, 2025, 342225, 98903025, 4846248225, 121156205625, 101892368930625, 12328976640605625, 16878369020989100625, 28372538324282678150625, 28372538324282678150625, 1390254377889851229380625, 3905224547492592103330175625, 1409786061644825749302193400625, 5245813935380396613153461643725625
(list;
graph;
refs;
listen;
history;
text;
internal format)



OFFSET

0,3


COMMENTS

For n>=2 numbers in this sequence are divisible by 25.
For n>=7 numbers in this sequence are divisible by 25^2.


LINKS

Table of n, a(n) for n=0..16.


MATHEMATICA

Table[Denominator[RootApproximant[N[8 Catalan + \[Pi]^2  Zeta[2, (4 k + 1)/4], 100], 1]], {k, 0, 20}]


CROSSREFS

Cf. A120268, A173945, A173947.
Sequence in context: A197671 A051112 A061843 * A197408 A197430 A195272
Adjacent sequences: A173945 A173946 A173947 * A173949 A173950 A173951


KEYWORD

frac,nonn


AUTHOR

Artur Jasinski, Mar 03 2010


STATUS

approved



