# 142 (number)

 ← 141 142 143 →
Cardinalone hundred forty-two
Ordinal142nd
(one hundred forty-second)
Factorization2 × 71
Divisors1, 2, 71, 142
Greek numeralΡΜΒ´
Roman numeralCXLII
Binary100011102
Ternary120213
Quaternary20324
Quinary10325
Senary3546
Octal2168
DuodecimalBA12
Vigesimal7220
Base 363Y36

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

## In mathematics

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

${\displaystyle {\frac {142^{1231}-1}{141}}}$ 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.