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Sequence number is a list of numbers that are linked by rule.

9514 1404 393

  354,998

Step-by-step explanation:

If the number is less than 350,000, it will not round to 400,000.

If the number is 355,000 or more, it will not round to 350,000.

The number (n) must satisfy ...

  350,000 ≤ n < 355,000

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If we're restricted to integers, the number could be any between 350,000 and 354,999, inclusive. One possibility is 354,998.