OFFSET
1,1
REFERENCES
W. Dunham, Euler: The Master of Us All, The Mathematical Association of America, Washington D.C., 1999, p. 66.
L. Euler, "Variae observationes circa series infinitas," Opera Omnia, Ser. 1, Vol. 14, pp. 216-244.
MATHEMATICA
Table[ Denominator[ Plus@@(Take[ Select[ Range[ 2, 50 ], GCD@@(Last/@FactorInteger[ # ])==1& ]^2-1, k ]^-1) ], {k, 1, 29} ]
CROSSREFS
KEYWORD
nonn
AUTHOR
Jason Earls, Jul 21 2001
EXTENSIONS
More terms from Dean Hickerson, Jul 24, 2001
STATUS
approved