Hakuluettelo:
Käännös:
hyperperfect number (suomeksi)
- Määritelmät:
- (label, en, mathematics, number theory) Any natural number ''n'' for which, for some positive integer ''k'', ''n'' = 1 + ''k''(σ(''n'') - ''n'' - 1), where σ(''n'') is the sum of the positive divisors of ''n''.