1642154

Appears in sequences

• Numbers k such that k and k+1 have the same number and sum of divisors.at n=19A054004
• Numbers k such that k and k+1 have the same sum of unitary and nonunitary divisors.at n=28A064729
• Numbers k such that A065608(k) = A065608(k+1).at n=26A065062
• 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=30A171183
• Numbers n such that Product_{d|n} sigma(d) = Product_{d|n+1} sigma(d).at n=16A280087
• 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=20A322256