918080

Appears in sequences

• Coordination sequence for root lattice B_6.at n=8A022148
• Numbers n such that sigma(n)-sigma(n+1)=n.at n=3A067803
• Numbers k such that sigma(k) = sigma(k+1)+sigma(k-1).at n=12A073500
• Numbers n such that sigma(n+1) - sigma(n) divides n.at n=17A225211