- published: 18 Jan 2016
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18 (eighteen) is the natural number following 17 and preceding 19.
In speech, the numbers 18 and 80 are sometimes confused. When carefully enunciated, they differ in which syllable is stressed: 18 /eɪtˈtiːn/ vs 80 /ˈeɪti/. However, in dates such as 1864, or when contrasting numbers in the teens, such as 17, 18, 19, the stress shifts to the first syllable: 18 /ˈeɪttiːn/. In some dialects, such as General American, there is little confusion because the single t sound in 80 becomes a d-like flap [ɾ], whereas the double t sound in 18 does not.
Eighteen is a composite number, its proper divisors being 1, 2, 3, 6 and 9. Three of these divisors (3, 6 and 9) add up to 18, hence 18 is a semiperfect number. Eighteen is the first inverted square-prime of the form p·q2.
It is a heptagonal number, and as the sum of the first three pentagonal numbers, it is a pentagonal pyramidal number. It is also the sum of the totient function for the first seven integers. It is the sixth lucas number.
Knowing
Is what people tell you
That you're thinking wrong
Embrace you,
But they really mean 'So long'
You talk to them
They laugh aloud
Yet they run to you
In any crowd
Please talk to me again
I need you
We're dancing
We will come and dance near you
We want to learn
Let us come and sitar with you
Distort my ears when
The music's loud
Yet you raise your hatchet
In the yellow crowd
Please talk to me again
I need you
Knowing
Is what people tell you
That you're thinking wrong
Embrace you,
But they really mean 'So long'
You talk to them
They laugh aloud
Yet they run to you
In any crowd
Please talk to me again
I need you