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Jan 31, 2017 at 13:39 vote accept T. Amdeberhan
Jan 31, 2017 at 10:15 comment added Wolfgang Very nice idea to look at $H_{n+1}-H_n$. Introducing a difference to pull out a common factor and get a lot of unexpected(?) telescoping offered later - would you believe it? :)
Jan 31, 2017 at 8:02 history answered Bruno Salvy CC BY-SA 3.0