Apr 05
12
30
- … is the atomic number of zinc.
- … is the number of days in the months April, June, September and November.
- … is in years of marriage, the pearl wedding anniversary.
- … is the code for international direct dial phone calls to Greece.
- … is the suggested year of Crucifixion of Jesus.
- … is the biggest size of Apple Cinema Display now.
- … is the designation of Interstate 30, a freeway that runs from Texas to Arkansas.
- … is the number of tracks on The Beatles’ eponymous album, usually known as The White Album.
- … is the number of cars in the Nintendo 64 game F-Zero X.
- … is a primorial#[1] as well as the sum of the squares of the integers 1, 2, 3 and 4.
- … is the first sphenic number#[2] and the first Giuga number.
- … is the largest number such that coprimes#[3] smaller than itself are also prime.
- … is a Harshad#[4] number.
… is also happened to be my age today.
“As through the calendar I delve
I pause to rejoice in April twelve.
Yea, be I in sickness or be I in health
My favorite date is April twealth.
…”
From “Lines in Praise of a Date Made Praiseworthy Solely by Something Very Nice That Happened to It”,
by Ogden Nash
[1]: For n ≥ 2, the primorial (n#) is the product of all prime numbers less than or equal to n. (source) [2]: A sphenic number is a positive integer that is the product of three distinct prime factors. (source) [3]: In mathematics, the integers a and b are said to be coprime or relatively prime if and only if they have no common factor other than 1 and −1, or equivalently, if their greatest common divisor is 1. (source) [4]: is an integer that is divisible by the sum of its digits in a given number base. (source)
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