Correct Ken, "Closeness" Duets is a Hayden album. Unfortunately I tend to think in terms of the artists being discussed and when Keith Jarrett was brought up, this was the LP that flashed in my mind. ( I absolutely LOVE it.)
"Golden Number" is another Hayden album, but with Hampton Hawes on piano. Hawes is another of my favorite players. Had this thread been about him I would have probably recommended it.
Both of these are on A&M Horizon and both are stunning recordings (at least on my system). I am a big fan of ECM artists, recordings and pressings, but in this case prefer the A&M.
Thanks for the new math Timwat.