Writers are not always the best people to trust with numbers or arithmetic. Or even the definition of words relating to numbers or arithmetic. And when the numerically challenged writer is given to hyperbole, the results can be quite ridiculous:
The writer is quite correct that 12-12-12 is a once-in-a-century date. But so is 11-27-12 and 06-04-13. In fact, if you’re using two digits for the year, then every date is a once-in-a-century date.
But, wait! There’s more! Like this attempt at showing examples of sequential numbers on Yahoo! Shine:
The number 10 is the same as the number 10, which is also the same as the number 10; they are not sequential, they are identical. The writer was probably just thinking (or really, not thinking) that the numbers form a familiar pattern and she thought that meant they were sequential.