84644

Appears in sequences

• Numbers k such that both k and k+1 are abundant.at n=23A096399
• Numbers k such that both sigma(k) >= 2*k-1 and sigma(k+1) >= 2*(k+1)-1.at n=25A103289
• Number of nX5 0..1 arrays with no element unequal to a strict majority of its king-move neighbors, with the exception of exactly one element, and with new values introduced in order 0 sequentially upwards.at n=9A280230
• Numbers k such that both k and k+1 are Zumkeller numbers (A083207).at n=21A328327
• a(n) = Sum_k k*A333275(n,k).at n=18A333277