Am I a Special N-bonacci Number?
05AB1E, 18 bytes

[DR²£O©‚˜³®&gt;‹#]³QZ


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Uses: [X,Y], N, A



I feel like some unintended functionality made that harder than it needed to be.

There's no greater-than-or-equal-to, never noticed that before.

And #³ didn't work, and required a ], for +1 bytes #]³.