OFFSET
2,1
COMMENTS
GCD of rows (5, 7, 17, 341, 13, 5461 ...) are Zsigmondy numbers A064080. - Paul Curtz, Sep 13 2013
REFERENCES
George Boros and Victor H. Moll, Irresistible Integrals: Symbolics, Analysis and Experiments in the Evaluation of Integrals, Cambridge University Press (2006), p. 100.
LINKS
Jean-François Alcover, Table of n, a(n) for n = 2..105
EXAMPLE
6/5;
5/7, 25/7;
28/85, 70/17, 588/85;
45/341, 1050/341, 4410/341, 3825/341;
...
MATHEMATICA
Table[(2^(2*k) - 1)/(2^(2*n) - 1)* Binomial[2*n, 2*k], {n, 2, 9}, {k, 1, n-1}] // Flatten // Denominator
CROSSREFS
KEYWORD
AUTHOR
Jean-François Alcover, Sep 10 2013
STATUS
approved