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

Though Macron’s centrist alliance is projected to win the most seats, observers predict that it could fall short of maintaining his majority — the golden number of 289 seats.

From Seattle Times

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