28990

Appears in sequences

• Starting positions of strings of 3 0's in the decimal expansion of Pi.at n=24A050202
• Composite numbers k such that sigma(k)*(phi(k) + 2) is a square.at n=37A065655
• Number of nX3 1..3 arrays containing at least one of each value, all equal values connected, rows considered as a single number in nondecreasing order, and columns considered as a single number in nonincreasing order.at n=9A166831
• Number of (n+2)X(2+2) 0..3 arrays with every 3X3 subblock row and column sum not 1 3 6 or 8 and every diagonal and antidiagonal sum 1 3 6 or 8.at n=7A252047
• T(n,k)=Number of (n+2)X(k+2) 0..3 arrays with every 3X3 subblock row and column sum not 1 3 6 or 8 and every diagonal and antidiagonal sum 1 3 6 or 8.at n=37A252053