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10 meses atrás | |
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Number of Carmichael numbers whose largest prime factor is prime(n) | 1 ano atrás | |
Numbers k such that k + phi(k) is a repunit | 3 anos atrás | |
a(n) is the least odd number k such that Omega(k) = n and Omega(k+2) = n+1 | 10 meses atrás |