1,5,19,13,211,7,2059,97,1009 - of interest?

[jens at voss-ahrensburg.de]

Hi Gottfried,

are you aware of Zsigmondy's Theorem? If not, see
http://mathworld.wolfram.com/ZsigmondyTheorem.html.

It seems your sequence is just Zs(n, 3, 2).

>  So this sequence may be of interest - on the other hand
>  I doubt it is of interest to add sequences for each
>  combination of a and b in f(n,a,b) .. ;-)

Well, Zs(n, 3, 2) is indeed not in the OEIS, but Zs(n, k, 1)
(for k € {2, ..., 7}) is. Being an ex-Collatz-junkie myself,
I strongly vote for the addition of Zs(n, 3, 2).

Regards,
Jens
--
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"tee-dah tah-dee tee-dah tah-dee"
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