53413

Appears in sequences

• Triangle read by rows: T(n,k) is the number of deco polyominoes of height n having k cells in the second column (n>=1, k>=0). A deco polyomino is a directed column-convex polyomino in which the height, measured along the diagonal, is attained only in the last column.at n=42A121581
• A monotonic doubly-fractal sequence. Erase the last (rightmost) digit of every integer: what is left is the sequence itself. The erased digits, one by one, form also the sequence itself.at n=40A127204
• Concatenate Fibonacci(n), Fibonacci(n+4) and Fibonacci(n+2).at n=5A134553
• a(n) = A273059(4n+1).at n=40A275917
• Odd numbers m such that sigma(x) = m has more than 1 solution.at n=19A300869
• Numbers m such that numbers m, m + 1, m + 2 and m + 3 have k, 2k, 3k and 4k divisors respectively.at n=31A340157