54250

Appears in sequences

• When expressed in base 2 and then interpreted in base 3, is a multiple of the original number.at n=32A062845
• Number of ways of placing kings with no more than 2 mutual attacks on an n X n chessboard symmetric about main diagonal.at n=7A143878
• Number of (n+2) X 3 binary arrays avoiding patterns 001 and 100 in rows and columns.at n=5A202310
• Number of (n+2)X8 binary arrays avoiding patterns 001 and 100 in rows and columns.at n=0A202315
• T(n,k)=Number of (n+2)X(k+2) binary arrays avoiding patterns 001 and 100 in rows and columns.at n=15A202317
• T(n,k)=Number of (n+2)X(k+2) binary arrays avoiding patterns 001 and 100 in rows and columns.at n=20A202317
• Number of n X 3 0..1 arrays avoiding 0 0 1 and 0 1 0 horizontally and 0 0 1 and 1 0 0 vertically.at n=7A207437
• Numbers n such that n = x + y, sigma_1(n) = sigma_1(x) + sigma_1(y) and sigma_2(n) = sigma_2(x) + sigma_2(y).at n=33A219033
• Triangle read by rows: T(n,k) is the number of n-digit numbers having a k-digit greatest prime factor.at n=16A294952
• a(n) = 5*(n+1)*(9*n+4).at n=34A304507
• Table read by rows, in which the n-th row lists all the primitive solutions k, in increasing order, such that k*sigma(k) = A337875(n).at n=35A337876