link to 3n+1 ?

[Maximilian Hasler]

%I A001281
%S A001281 2,1,8,2,14,3,20,4,26,5,32,6,38,7,44,8,50,9,56,10,62,11,68,12,74,13,80,
%N A001281 Image of n under n->n/2 if n even, n->3n-1 if n odd.
%Y A001281 Cf. A037082.

I may be wrong but at first glance, the xref given in this record
refers to something completely unrelated(?) (Primes of the form n!!! +
1),
shouldn't it rather refer to

A006370  Image of n under the `3x+1' map.

or the like? (I could not spot an obvious typo comparing with id's at
http://www.research.att.com/~njas/sequences/Sindx_3.html#3x1

On that token,

%S A008908 1,2,8,3,6,9,17,4,20,7,15,10,10,18,18
%N A008908 Number of halving and tripling steps to reach 1 in `3x+1' problem.
%Y A008908 a(n) = A006577(n) + 1.

seems inconsistent with

%S A006577 0,1,7,2,5,8,16,3,19,6,14,9,9,17,17,4,12,
%N A006577 Number of halving and tripling steps to reach 1 in `3x+1' problem.

(the %N should not be identical if values differ)

M.H.



I've now added all the sequences that were submitted
to this point in time, including those that were "lost".

[The "lost" ones have numbers in the range A130707 - A130742.
There may be some duplicates there - let me know if you notice
any.  I checked, but not very thoroughly.  Getting the "lost" ones
out of the log files was a lot of work.]

The next project is to process "Comments".  There are about 500,

In the meantime, please remember that the OEIS is on vacation.

Neil