33998

Appears in sequences

• Numbers k such that k and k+1 have same sum of divisors.at n=14A002961
• Numbers k such that k and k+1 have the same number and sum of divisors.at n=4A054004
• Numbers k such that sigma(k) divides sigma(k+1), where sigma(k) is sum of positive divisors of k.at n=27A058072
• Numbers k such that sigma(k+1) divides sigma(k), where sigma(k) is the sum of positive divisors of k.at n=34A058073
• 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=9A063071
• 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=12A063964
• Numbers k such that k and k+1 have the same sum of unitary divisors (A034448).at n=36A064125
• Numbers k such that k and k+1 have the same sum of unitary divisors and the same number of divisors.at n=8A064348
• Numbers k such that k and k+1 have the same sum of unitary and nonunitary divisors.at n=6A064729
• Numbers k such that A065608(k) = A065608(k+1).at n=7A065062
• Numbers k such that the number of primes <= k is equal to the sum of primes from the smallest prime factor of k to the largest prime factor of k.at n=10A074210
• 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=7A171183
• Number of nondecreasing arrangements of n+2 numbers in 0..8 with the last equal to 8 and each after the second equal to the sum of one or two of the preceding four.at n=35A189325
• Expansion of (psi(-x) * phi(x)^4)^2 in powers of x where phi(), psi() are Ramanujan theta functions.at n=37A209942
• 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=22A223136
• Table of consecutive numbers with the same sum of divisors.at n=28A225757
• Runs of consecutive numbers with the same number and sum of divisors.at n=8A225758
• Numbers k such that the average of the divisors of k and k+1 is the same.at n=13A238380
• Numbers n such that Product_{d|n} sigma(d) = Product_{d|n+1} sigma(d).at n=4A280087
• 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=26A293183