Issuers tack it on so that the whole card number will satisfy a specific mathematical test—the Luhn algorithm. Here’s how the algorithm works: Write out all but the last digit of the card number.

Kerr County teams have located most of the 160 people previously unaccounted for in the wake of the July 4th Texas flooding, with just three still missing.

Mathematical modeling gene regulatory networks is important for understanding and controlling them, with various drugs and their dosage regimens. The ordinary differential equations approach is ...

A picture circulating online challenged people to determine the missing number from what looked like a simple sequence of numbers from 1 to 19. "Which number is missing?" the puzzle asks. At first ...

Microsoft Excel: How to Find Missing Numbers in a Sequence. Locating missing sequential numbers can be an arduous task when working with long lists of data. For example, you might want to locate ...

Given an array containing n distinct numbers taken from 0, 1, 2, ..., n, find the one that is missing from the array.

Since its unique advantages in the tradeoff between data acquisition rate and hardware cost, the scanning 1-D multiple-input-multiple-output (MIMO) array setup has been widely used in nondestructive ...

The ocean is vast, and it can be difficult to find missing objects and people in it. To help search and rescue missions, MIT has developed a new algorithm that helps to identify hidden "traps" in ...

The ocean can be a ferociously wild place, which makes locating lost people and objects a tall order for first responders. Researchers at MIT have developed a new algorithm that takes stock of ...