[seqfan] 1862

[Éric Angelini]

1862.
Pick any two digits: their absolute 
difference is unique (for 1862). Indeed
the set of all 2-digit abs diffs of 1862 
is 7,5,1,2,6,4, with no repeated element.

The same with 10 or 1037
(10 --> 1 and 1037 --> 1,3,2,4,7,6).

With a(1) = 10, the seq has precisely...
... 1862 terms. Which is the header
of this msg. (Yes, we love selfref')
Best,
É.
(many thanks to Jean-Marc Falcoz, in copy)