Thanks Bunty
All done now - why the title Analogy?
I'd typed the multiples of 305 in the 28000s into my calculator - there were only a few - looking for 28-6- and spotted 28060 straight away but somehow missed 28365.
Sorry I meant 7d rather than 3d I had 3335 but it wouldn't fit without 28365.
Hard work but satisfying.