5111729 is a single 7-digit number. A single number does not make a sequence.
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Anything you like. You specify whatever rule you like and the resulting set of numbers is the sequence based on that rule.
A number sequence is an ordered set of numbers. There can be a rule such that the next number in the sequence can be determined by the values of some or all of the preceding terms in the sequence. However, the sequence for a random walk illustrates that such a rule is not necessary to define a sequence.
A single number, such as 12631.5, does not make a sequence.
Without further terms in the sequence, it is impossible to determine what the rule in the sequence is.
Since a given sequence of numbers can be designed to follow any rule, you have to use a system of trial and error to see if you can discover the rule. Sometimes the rule is obvious, sometimes it is extremely complicated. Try to invent a rule which would produce the sequence that you observe.