207118
domain: N
Appears in sequences
- Numbers k such that sigma(k) = sigma(k+5).at n=32A015865
- Number T(n,k) of tilings of a 5 X n rectangle with pentominoes of any shape and exactly k pentominoes of shape X; triangle T(n,k), n>=0, read by rows.at n=12A247711
- Number of tilings of a 5 X n rectangle using n pentominoes of any but the X shape.at n=7A247775