3 added 23 characters in body
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Starting with $1$, you proceed as follows:

Add $1$, and multiply the result by $10$.

This gives you $20$.

Subtract $1$, and multiply the result by $9$.

This gives you $171$.

Add $1$, and multiply the result by $8$.

This gives you $1376$.

Subtract $1$, and multiply by $7$.

This gives you $9625$. Etc.


How do you get to this result?

Look at the last three numbers given. If you take the ratio of the last two values ($288775/57756$), you get a result very close to $5$. If you take the ratio $57756/9625$ You get a result very close to $6$. From there on it's just some fiddling...

Starting with $1$, you proceed as follows:

Add $1$, and multiply the result by $10$.

This gives you $20$.

Subtract $1$, and multiply the result by $9$.

This gives you $171$.

Add $1$, and multiply the result by $8$.

This gives you $1376$.

Subtract $1$, and multiply by $7$.

This gives you $9625$. Etc.

Starting with $1$, you proceed as follows:

Add $1$, and multiply the result by $10$.

This gives you $20$.

Subtract $1$, and multiply the result by $9$.

This gives you $171$.

Add $1$, and multiply the result by $8$.

This gives you $1376$.

Subtract $1$, and multiply by $7$.

This gives you $9625$. Etc.


How do you get to this result?

Look at the last three numbers given. If you take the ratio of the last two values ($288775/57756$), you get a result very close to $5$. If you take the ratio $57756/9625$ You get a result very close to $6$. From there on it's just some fiddling...

2 added 23 characters in body
source | link

Starting with $1$, you proceed as follows:

Add $1$, and multiply the result by $10$.

This gives you $20$.

Subtract $1$, and multiply the result by $9$.

This gives you $171$.

Add $1$, and multiply the result by $8$.

This gives you $1376$.

Subtract $1$, and multiply by $7$.

This gives you $9625$. Etc.

Starting with $1$, you proceed as follows:

Add $1$, and multiply the result by $10$.

This gives you $20$.

Subtract $1$, and multiply the result by $9$.

This gives you $171$.

Add $1$, and multiply the result by $8$.

This gives you $1376$.

Subtract $1$, and multiply by $7$.

Etc.

Starting with $1$, you proceed as follows:

Add $1$, and multiply the result by $10$.

This gives you $20$.

Subtract $1$, and multiply the result by $9$.

This gives you $171$.

Add $1$, and multiply the result by $8$.

This gives you $1376$.

Subtract $1$, and multiply by $7$.

This gives you $9625$. Etc.

1
source | link

Starting with $1$, you proceed as follows:

Add $1$, and multiply the result by $10$.

This gives you $20$.

Subtract $1$, and multiply the result by $9$.

This gives you $171$.

Add $1$, and multiply the result by $8$.

This gives you $1376$.

Subtract $1$, and multiply by $7$.

Etc.