1907020800

Appears in sequences

• Smallest number m such that the numerator of sigma(m)/m is equal to n, or zero if no such m exists.at n=22A239578
• Triangle read by rows: T(n, k) is the smallest x such that the denominator of sigma(x)/x is equal to n and the numerator of sigma(x)/x is congruent to k modulo n.at n=14A242370
• Numbers k such that denominator(sigma(k)/k) = 6.at n=4A262359