The phrase 'a string of numbers' is correct and usable in written English.
You can use it to refer to a group of numbers that have been strung together, either in sequence or seemingly randomly. For example, "He inputted a string of numbers into the calculator."
As Mozart knew, a successful opera is not simply a string of numbers but drama in music.
And while the subjects were answering, he gave them a string of numbers to memorize and recall.
Icann does many things, but it's often described as a kind of web phone directory – matching a string of numbers to their domain names.
It translates the names of Web sites like Facebook.com or Google.com into a string of numbers that the Internet's underlying technology can understand.
Behind the scenes, the actual address is a string of numbers (called an I.P. address, for Internet protocol) that looks something like this: 74.125.53.100.
Last month, researchers at Symantec also speculated that a string of numbers found in the program — 19790509 — while seeming random, might actually be significant.
The 'Renew ORB' technology looks for smartphones with their wifi turned on and logs their MAC address - a string of numbers unique to each device.
This was the first in a string of number theoretic results that would span most of the century.
In 2006, Take That, minus Robbie Williams, reformed for a sell out stadium tour and enjoyed a career renaissance with a string of number one songs, starting with the single Patience.
The band have a string of number one songs on the Billboard Alternative Songs and Hot Mainstream Rock Tracks charts.
Now look at me, one of the world's most popular R&B singers and a multi-millionaire with a string of number ones.
