Explanations, extensions requested

[David Wilson]

----- Original Message -----
From: "Jack Brennen" <jack at brennen.net>
To: "Sequence Fanatics" <seqfan at ext.jussieu.fr>
Sent: Friday, February 07, 2003 3:14 PM
Subject: Re: Explanations, extensions requested


> If I'm not mistaken, A005184 consists of each odd number N whose Collatz
sequence contains
> a higher multiple of N.  Collatz:  a[n+1] = a[n]/2 if a[n] is even,
3*a[n]+1 if a[n] is odd.

%C A005184 Odd n such that Collatz trajectory of n contains some kn > n.

> If I were going to try to extend the sequence beyond what is shown in the
EIS,
> I'd use a native language like C -- PARI/GP is just too slow...

Not really interested in that, I only have Perl anyway.  Just wanted to
understand the relevance
of the sequence.  Thanx.