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 A214391 Denominators of Sum_{n>=1} 1/A045542(n). 6
 3, 21, 168, 280, 210, 1365, 42315, 8463, 45136, 406224, 253890, 310310, 744744, 744744, 94582488, 661416, 110236, 21496020, 924328860, 7394630880, 894750336480, 5070251906720, 5704033395060, 6375096147420, 6375096147420, 2550038458968, 2550038458968 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Goldbach-Euler: sum A214390(n)/a(n) -> 1, n -> oo. LINKS Reinhard Zumkeller, Table of n, a(n) for n = 1..1000 L. Bibiloni, P. Viader, and J. Paradis, On a Series of Goldbach and Euler, Amer. Math. Monthly, 113 (2006), pp. 206-220. PROG (Haskell) import Data.Ratio ((%), denominator) a214391 n = a214391_list !! (n-1) a214391_list = map denominator \$ scanl1 (+) \$ map (1 %) a045542_list CROSSREFS Cf. A214390 (numerators). Sequence in context: A179815 A118353 A262977 * A046637 A220103 A132805 Adjacent sequences:  A214388 A214389 A214390 * A214392 A214393 A214394 KEYWORD nonn,frac AUTHOR Reinhard Zumkeller, Jul 15 2012 STATUS approved

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Last modified September 17 04:03 EDT 2019. Contains 327119 sequences. (Running on oeis4.)