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155 (number): Difference between revisions

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'''155''' '''(one hundred [and] fifty-five)''' is the [[natural number]] following [[154 (number)|154]] and preceding [[156 (number)|156]]. It is a [[composite number]] and a [[semiprime]].
'''155''' ('''one hundred [and] fifty-five''') is the [[natural number]] following [[154 (number)|154]] and preceding [[156 (number)|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. {{OEIS|id=A055233}} Only three other small semiprimes (10, 39, and 371) share this attribute.
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. {{OEIS|id=A055233}} Only three other small semiprimes (10, 39, and 371) share this attribute.

Revision as of 17:59, 28 May 2014

← 154 155 156 →
Cardinalone hundred fifty-five
Ordinal155th
(one hundred fifty-fifth)
Factorization5 × 31
Divisors1, 5, 31, 155
Greek numeralΡろーΝにゅーΕいぷしろん´
Roman numeralCLV
Binary100110112
Ternary122023
Senary4156
Octal2338
Duodecimal10B12
Hexadecimal9B16

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. OEISA000019

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155 is also:

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References