24940

I think it will be in A3 because
1. all the sequences going down were double the term above.
2. We noticed that A0 would contain all the odd numbers.
therefore 125 would appear in this sequence.
3. so A1 would contain 250
4. A2 would contain 500
5. And finally A3 would contain 1000.

Also 125 can not be halved because the sequences only contain whole numbers. therefore it cannot appear in any other sequence apart from A0.