To find the nth decagonal number, you can use the following formula:

`decagonal_number = n * (3n - 1) / 2 * 10`

where `n`

is the index of the decagonal number.

Here's the Typescript function that implements this formula:

`index.ts91 chars4 lines`

To use this function, simply call it with the index of the decagonal number you want to find:

index.ts68 chars2 lines

find the nth decagonal number in typescript

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