440013

Appears in sequences

• Numbers k such that k and k+1 have the same number and sum of divisors.at n=13A054004
• Numbers k such that sigma(k)*omega(k) = sigma(k+1)*omega(k+1), where omega(k) is the number of distinct prime divisors of n (A001221).at n=32A063071
• Numbers k such that k and k+1 have the same sum of unitary divisors and the same number of divisors.at n=21A064348
• Numbers k such that k and k+1 have the same sum of unitary and nonunitary divisors.at n=23A064729
• Numbers k such that A065608(k) = A065608(k+1).at n=19A065062
• Numbers k such that sigmawt(k) = sigmawt(k+1), where sigmawt(k) is the sum of the divisors of k weighted by divisor multiplicity in k.at n=24A171183
• Runs of consecutive numbers with the same number and sum of divisors.at n=26A225758
• Numbers k such that the average of the divisors of k and k+1 is the same.at n=36A238380
• Numbers n such that floor(antisigma(n) / sigma(n)) = floor(antisigma(n+1) / sigma(n+1)).at n=30A244666
• Numbers n such that Product_{d|n} sigma(d) = Product_{d|n+1} sigma(d).at n=11A280087
• Numbers k such that t(k) = t(k+1) where t(k) = tau(k) + sigma(k) = A007503(k) is the number of subgroups of the dihedral group of order 2k.at n=13A322256