Pair of digits self-differences

[Eric Angelini]

[HUGO] :
> But if I assume those additional rules, I get a sequence
> (by hand):
> 1 2 3 5 6 9 16 17 90 98 170 181 901 1090 8010 70001 80010
> 90001 ...

... yes, indeed, congratulations -- my friend Jacques Tramu
gets this with « a little and slow pgm of mine » :

  1 2 3 5 6 9 16 17 90 98 170 181 901 1090 8010 70001 80010
  90001 98000 98808 99011 107001 111010 800000  1000900 1100010
  9080000 9909080 80008090 90001010 100070000 100101010 ...

... I'll send this to Neil asap...

Thanks to all of you,
É.