449295

Appears in sequences

• f-perfect numbers, where f(m) = m + 1.at n=6A066229
• Odd numbers n such that abs(sigma(n)-2n) <= n^(1/3). Abundance-radius = abs(sigma(n)-2n) does not exceed cubic root of n and n is odd.at n=14A088010
• Ceiling(n/2)-perfect numbers.at n=28A177050
• Odd deficient numbers whose abundancy is closer to 2 than any smaller odd deficient number.at n=10A188597
• Odd numbers n such that 2n/sigma(n) - 1 = 1/x for some positive integer x.at n=37A222263
• Number of length n+2 0..8 arrays with no consecutive three elements summing to more than 8.at n=5A241614
• Number of length 6+2 0..n arrays with no consecutive three elements summing to more than n.at n=7A241621
• Unitary barely deficient numbers: unitary deficient numbers k such that usigma(k)/k > usigma(m)/m for all unitary deficient numbers m < k, where usigma(k) is the sum of the unitary divisors of k (A034448).at n=11A302572
• Numbers m with deficiency 30: sigma(m) - 2*m = -30.at n=8A389700