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142 (number) : ウィキペディア英語版 | 142 (number)
142 (one hundred () 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.〔Erich Friedman, "(What's Special About This Number )": 142. Accessed 5 JAN 2008.〕 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.
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