As in the letter "A" in the number name (i.e., o-n-e)? I'd say 1,000 I feel none of the number starts with A. I don't think he meant 'start'... He/she means "one onward" I think 1000 is right, sorry misunderstood the question, my mistake.
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That depends, on what you mean, i.e., number one in what?
everyone knows it is one
799 would be the 400th odd number even if '1' were not the first one.
The answer is 3
THOUSAND