golden number

British  

noun

1. a number between 1 and 19, used to indicate the position of any year in the Metonic cycle, calculated as the remainder when 1 is added to the given year and the sum is divided by 19. If the remainder is zero the number is 19

   the golden number of 1984 is 9

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Example Sentences

Valente capped her week in Glasgow, Scotland, on Wednesday by making that total a nice, round — and golden — number.

From Washington Times

Their phone number mostly consisted of the same digit repeated many times, making it a prized so-called "golden number".

From BBC

But there’s no guarantee they’ll hit that “golden number.”

From New York Times

On Twitter, the movement has taken on the hashtag #LaserRayUntil100K, which refers to a pledge among users to keep the laser rays until Bitcoin hits that golden number.

From Slate

As experts learned more about the spread of the virus, “6 feet” became the golden number: The distance we should stay away from others to prevent the spread of Covid-19, yes, but also a shorthand for how to navigate socialization in the new world.

From New York Times