7

This number is a prime.

Just showing those entries submitted by 'McAlee': (Click here to show all)

Seven Segment Display

Early electronic instruments incorporated alphanumeric displays that employed discrete circuit components known as 7-segment light-emitting diodes (LED's). [McAlee]

According to the History Channel - 7 machine tools started the modern age: Lathe, Planer, Mill, Grinder, Drill, Band Saw, and Punch-Press. [McAlee]

7 is the smallest Carol prime. [McAlee]