naravno število From Wikipedia, the free encyclopedia
15 (pétnajst ali petnájst) je naravno število, za katero velja 15 = 14 + 1 = 16 − 1.
| |||
Glavni števnik | petnajst | ||
Vrstilni števnik | petnajsti | ||
Številski sistem | petnajstiški | ||
Razcep | |||
Rimska številka | XV | ||
Dvojiško | 1111 | ||
Šestnajstiško | F | ||
Matematične lastnosti | |||
---|---|---|---|
φ(15) = 8 | |||
τ(15) = 4 {1, 3, 5, 15} | |||
σ(15) = 24 | |||
π(15) = 6 | |||
μ(15) = 1 | |||
M(15) = -1 |
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