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1 155 Article 155 (one hundred [and] fifty-five) is the natural number following 154 and preceding 156. It is a composite number and a semiprime. If you add up all the primes from the least through the greatest prime factors of 155, that is, 5 and 31, the result is 155. (sequence A055233 in the OEIS) Only three other small semiprimes (10, 39, and 371) share this attribute. There are 155 primitive permutations of degree 81. OEIS A000019

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155

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1. EN 155 (one hundred [and] fifty-five) is the natural number following 154 and preceding 156.
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