-5
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What comes next in this sequence? 1, 4, 3, 11, 15, 13, ?

No complex Maths is required!

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3
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It's

17, according to OEIS.

Reasoning:

1 (one) requires three letters to write in English, and is the smallest number to do so.
4 (four) requires four letters to write in English, and is the smallest number to do so.
3 (three) requires five letters to write in English, and is the smallest number to do so.
11 (eleven) requires six letters to write in English, and is the smallest number to do so.
15 (fifteen) requires seven letters to write in English, and is the smallest number to do so.
13 (thirteen) requires eight letters to write in English, and is the smallest number to do so.
17 (seventeen) requires nine letters to write in English, and is the smallest number to do so.

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