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133 (number) : ウィキペディア英語版 | 133 (number)
133 (one hundred () thirty-three) is the natural number following 132 and preceding 134. ==In mathematics== 133 is an ''n'' whose divisors (excluding ''n'' itself) added up divide φ(''n''). It is an octagonal number and a Harshad number. It is also a happy number. 133 is a repdigit in base 11 (111) and base 18 (77), whilst in base 20 it is a cyclic number formed from the reciprocal of the number three. 133 is a semiprime: a product of two prime numbers, namely 7 and 19. Since those prime factors are Gaussian primes, this means that 133 is a Blum integer.
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