A sequence unique including differences

[franktaw at netscape.net]

Thanks, I hadn't seen that.  I think A140778 should be added to this 
index entry; and so should A061577 (which I just found from the link in 
A005228).

Also, I would crossrefs in A005228 to both A037257 and A140778, and a 
crossref in A140778 to A005228.

-----
I agree with Max's comment concerning the name of A005228; it also 
applies to A061577 (with the additional proviso needed that a(1) = 2).

Franklin T. Adams-Watters

-----Original Message-----
From: N. J. A. Sloane <njas at research.att.com>

Franklin:  there is an entry in the Index to
the OEIS that is relevant, in case you missed it:

sequence and first differences include all numbers: A005228 *, A030124 
, A037257
, A037258 , A037259


 Best regards
             Neil








Max said:
The current definition of A005228 sounds like a property not a definition:

%N A005228 Sequence and first differences (A030124) include all
numbers exactly once.

I think there many such sequences exist....

dates back twenty years or more (see the M2629 number on it?)
It was chosen to make the reader think.

Nevertheless I will add a comment spelling out a more precise definition.