7 (sédem) je naravno število, za katero velja 7 = 6 + 1 = 8 − 1.
7 | |
---|---|
Glavni števnik | sedem |
Vrstilni števnik | sedmi |
Številski sistem | sedmiški |
Razcep | 4. praštevilo |
Rimska številka | VII |
Dvojiško | 111 |
Osmiško | 7 |
Dvanajstiško | 7 |
Šestnajstiško | 7 |
Matematične značilnosti | |
φ(7) = 6 | |
τ(7) = 2 {1, 7} | |
σ(7) = 8 | |
π(7) = 4 | |
μ(7) = -1 | |
M(7) = -2 |
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