111824

Appears in sequences

• Numbers k such that both k and k+1 are abundant.at n=31A096399
• Numbers k such that both sigma(k) >= 2*k-1 and sigma(k+1) >= 2*(k+1)-1.at n=33A103289
• Numbers k such that both k and k+1 are Zumkeller numbers (A083207).at n=29A328327
• Numbers k such that k^2, (k+1)^2 and (k+2)^2 are all abundant numbers.at n=37A383391
• Numbers k such that each of k and k+1 is either a practical number (A005153) or an almost practical number (A174533).at n=20A387654