99717

Appears in sequences

• Pentagonal numbers with only odd digits.at n=18A117985
• Numbers which are both lucky and pentagonal.at n=21A128511
• Irregular triangle read by rows: T(n,k) = number of ways k brooks (0 <= k <= 2n+1) can be placed on the grid points of an n triboard so that no two brooks lie in the same straight line.at n=25A260333
• Number of n X n 0..1 arrays with every element equal to 0, 1, 3, 4 or 6 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.at n=6A300938
• Number of nX7 0..1 arrays with every element equal to 0, 1, 3, 4 or 6 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.at n=6A300943