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155 (number)

From Wikipedia, the free encyclopedia

Natural number

155

←150 151 152 153 154 155 156 157 158 159 →

←0 100 200 300 400 500 600 700 800 900 →

one hundred fifty-five

155th
(one hundred fifty-fifth)

5 × 31

1, 5, 31, 155

ΡΝΕ´

CLV,clv

10011011₂

12202₃

415₆

233₈

10B₁₂

9B₁₆

155 (one hundred [and] fifty-five) is thenatural number following154 and preceding156.

In mathematics

155 is:

acomposite number
asemiprime.
adeficient number, since1+5+31=37<155.
odious, since itsbinary expansion $10011011_{2}$ has a total of 5 ones in it.

There are 155 primitivepermutation groups of degree 81.OEIS: A000019

If one adds up all the primes from the least through the greatest prime factors of 155, that is, 5 and 31, the result is 155. (sequenceA055233 in theOEIS) Only three other "small" semiprimes (10, 39, and 371) share this attribute.

References

External links

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Integers

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