50039

Appears in sequences

• Numbers k such that sigma(k) divides sigma(k+1), where sigma(k) is sum of positive divisors of k.at n=34A058072
• Numbers k such that sigma(k+1) = 3 * sigma(k).at n=5A077087
• Square roots of the deficiencies of the squares of A289274.at n=9A288144
• Square roots of the deficiencies of the squares of A289275.at n=34A288145
• Numbers k such that k![4] - 512 is prime, where k![4] = A007662(k) = quadruple factorial.at n=32A329183