566561

Appears in sequences

• Numbers k such that k divides the (right) concatenation of all numbers <= k written in base 20 (most significant digit on right).at n=26A061949
• Number of integers q such that phiter(q)=n where phiter(n) = A064415(n).at n=16A064416
• Number of permutations of length n which avoid the patterns 1234, 2341, 3421.at n=16A116818