84134

Appears in sequences

• Numbers k such that k and k+1 have same sum of divisors.at n=22A002961
• Numbers k such that k and k+1 have the same number and sum of divisors.at n=7A054004
• 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=13A063071
• Numbers k such that k and k+1 have the same sum of squarefree divisors, or sqf(k) = sqf(k+1), where sqf(k) = A048250(k).at n=26A063964
• Numbers k such that k and k+1 have the same sum of unitary divisors and the same number of divisors.at n=12A064348
• Numbers k such that k and k+1 have the same sum of unitary and nonunitary divisors.at n=11A064729
• Numbers k such that A065608(k) = A065608(k+1).at n=10A065062
• 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=12A171183
• Number of n element 0..3 arrays with each element the minimum of 5 adjacent elements of a random 0..3 array of n+4 elements.at n=12A217951
• Numbers n such that sigma(n+1) - sigma(n) = k*n for some integer k, where sigma(n) = A000203 (sum of divisors of n).at n=30A223136
• Runs of consecutive numbers with the same number and sum of divisors.at n=14A225758
• Numbers k such that the average of the divisors of k and k+1 is the same.at n=18A238380
• Numbers k such that 3*R_(k+2) - 10^k is prime, where R_k = 11...1 is the repunit (A002275) of length k.at n=22A256375
• Numbers n such that Product_{d|n} sigma(d) = Product_{d|n+1} sigma(d).at n=6A280087
• Numbers k such that bsigma(k) = bsigma(k+1), where bsigma(k) is the sum of the bi-unitary divisors of k (A188999).at n=40A293183
• 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=7A322256
• Numbers k such that s(k) = s(k+1) where s(k) is the sum of unitary, squarefree divisors of k, including 1 (A092261).at n=22A327875
• Numbers k such that s(k) = s(k+1), where s(k) is the sum of recursive divisors of k (A333926).at n=21A333949
• Numbers k such that k and k+1 have the same average of unitary divisors.at n=33A349222
• Number k such that A033634(k) = A033634(k+1).at n=24A349224