56252

Appears in sequences

• a(n) is the least multiple of n, k*n say, such that phi(k) | sigma(k).at n=48A015756
• Length of n-th term of A022470.at n=38A022471
• Permanent of the n X n matrix whose element (i,j) equals phi(|i-j|).at n=6A085510
• Numbers n such that sigma(n) = 5*phi(n).at n=11A136547
• Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, 0), (-1, 0, 0), (0, 0, 1), (1, 1, -1), (1, 1, 1)}.at n=8A150833
• Array A(k,n) of the number of points of the A_k lattice with maximum infinity norm n, read by antidiagonals.at n=60A175197