25774633

Appears in sequences

• Integers m such that A240923(m) = 1, where A240923(n) = numerator(sigma(n)/n) - sigma(denominator(sigma(n)/n)).at n=29A240991
• Odd composite numbers n, not squares of primes, such that (A001065(n) - A032742(n)) divides (n - A032742(n)), where A032742 gives the largest proper divisor, and A001065 is the sum of proper divisors.at n=9A326064
• Odd numbers k that have a divisor d such that sigma(d)*d is equal to k.at n=33A327599
• Numbers k such that sigma(A253560(k)) / A253560(k) is equal to (sigma(k)+1) / k, where A253560(k) = k multiplied by its largest prime factor.at n=42A387406
• Numbers k for which A053585(sigma(k)) is equal to A053585(k) and that satisfy also Euler's condition for odd perfect numbers (A228058).at n=31A388276