61424

Appears in sequences

• Numbers k such that both k and k+1 are abundant.at n=13A096399
• Numbers k such that both sigma(k) >= 2*k-1 and sigma(k+1) >= 2*(k+1)-1.at n=15A103289
• Number of n X 2 0..2 arrays with no element equal to exactly one horizontal or vertical neighbor, with new values 0..2 introduced in row major order.at n=9A241073
• T(n,k)=Number of (n+1)X(k+1) arrays of permutations of 0..(n+1)*(k+1)-1 with each element having directed index change 0,0 0,1 1,0 -1,0 or 0,-2.at n=36A264217
• Number of (1+1) X (n+1) arrays of permutations of 0..n*2+1 with each element having directed index change 0,0 0,1 1,0 -1,0 or 0,-2.at n=8A264218
• Numbers k such that both k and k+1 are Zumkeller numbers (A083207).at n=11A328327
• Expansion of (1 / theta_4(x) - 1)^10 / 1024.at n=5A341371
• Coefficient of x^n in the expansion of 1 / ( (1-x) * (1-x-x^2) )^(2*n).at n=5A372460
• Index of first occurrence of -n in A000319, or -1 if -n never appears there.at n=42A381231
• Numbers k such that each of k and k+1 is either a practical number (A005153) or an almost practical number (A174533).at n=11A387654