159841

Appears in sequences

• Hyperperfect numbers: k = m*(sigma(k) - k - 1) + 1 for some m > 1.at n=17A007592
• Hyperperfect numbers: x such that x = 1 + k*(sigma(x)-x-1) for some k > 0.at n=21A034897
• a(n) = n^5 - n^3 + n^2.at n=11A133071
• Nonsemiprime hyperperfect numbers.at n=6A133447
• a(n) = p^5 - p^3 + p^2, where p = prime(n).at n=4A135180