If you mean: 1 4 9 16 and 25 then they are square numbers
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The name of the sequence 1491625 is not specified. It appears to be a set of consecutive integers with no obvious pattern or designated name.
1,4,9,16,25
Fibonacci sequence Fibonacci sequence
That'd be the Fibonnaci sequence (this time without the wikipedia URL :P)
That is called a sequence.
A Fibonacci series