142 (number)

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← 141 142 143 →
Cardinalone hundred forty-two
(one hundred forty-second)
Factorization2 × 71
Divisors1, 2, 71, 142
Greek numeralΡΜΒ´
Roman numeralCXLII

142 (one hundred [and] forty-two) is the natural number following 141 and preceding 143.

In mathematics[edit]

There is no answer to the equation φ(x) = 142, making 142 a nontotient. There are 142 planar graphs with 6 unlabeled vertices.[1]

is the smallest repunit prime in base 142, it has 2648 digits, while the smallest repunit prime in negative base -142 is only 20023. Besides, the smallest Fermat prime in base 142 is 406586897, and the smallest Wieferich prime in base 142 is 143111.

In astrophysics[edit]

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See also[edit]


  1. ^ Erich Friedman, "What's Special About This Number Archived 2018-02-23 at the Wayback Machine": 142. Accessed 5 JAN 2008.