13800465

Appears in sequences

• 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=18A088010
• Odd numbers whose abundancy is closer to 2 than any smaller odd number.at n=15A171929
• Odd deficient numbers whose abundancy is closer to 2 than any smaller odd deficient number.at n=13A188597
• Odd numbers k that are closer to being perfect than previous terms and also satisfy the conditions that sigma(k) preserves the 3-adic valuation of k, and that sigma(k) == -k (mod 3).at n=17A386420