155 (number)
155 (one hundred fifty-five or one hundred and fifty-five) is the natural number following 154 and preceding 156. It is a composite number.
If you add up all the primes between the least and greatest prime factors of 155, that is, 5 and 31, the result is 155. (sequence A055233 in OEIS)
There are 155 primitive permutations of degree 81. A000019
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