THis is quite impossible feat now, but if you go back to before 2010, you can simply get 17 bitcoin by mining with your own computer rig and just get the mining rewards. The only way is by gambling, either gambling site or some altcoin. Both which are too risky and too hard to double your money. For long term maybe you can start a service that accept bitcoin, just like other business a rough start but if you determined enough you willl earn much more than that.
Gambling is not a way to reach such a big target, gambling even cannot make you reach a small target because it is not designed for that.
Gambling is just for fun most of the times, the ones who tries to complete their big targets with gambling always end up losing everything they already own.
Yeah and if you are hoping to that money from gambling then that is never possible, in fact you will loose everything that you hold, as gambling is the fastest way to loose money.