25811 is a single (5-digit) number and a single number does not define a sequence.
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It is an arithmetic sequence for which the index goes on and on (and on).
That's an arithmetic sequence.
Arithmetic
It is an arithmetic sequence if you can establish that the difference between any term in the sequence and the one before it has a constant value.
No. An 'arithmetic' sequence is defined as one with a common difference.A sequence with a common ratio is a geometricone.