Posts: 1,395

Threads: 91

Joined: Aug 2007

Gottfried Wrote:m=arbitrary, integer>0:

(hope I didn't make an index-error).

This formula can also be found in

E.T.BELL ,"The iterated Exponential Integers", Annals of Mathematics (193 p539-557

Are you sure Gottfried? I didnt find it in the mentioned article.

Posts: 789

Threads: 121

Joined: Aug 2007

bo198214 Wrote:Are you sure Gottfried? I didnt find it in the mentioned article.

Too bad. I don't know, where my brain was... I had just skimmed through some articles and meant to have caught the source correctly. I'll seek, where I've actually have seen it, maybe in Abramowitsch/Stegun...

Anyway, it is easy to derive it with pen & paper.

I'll be back in the evening, going for a walk today -

Gottfried

Gottfried Helms, Kassel