666180

Appears in sequences

• Number of 0..n arrays x(0..5) of 6 elements with zero 5th difference.at n=22A200157
• a(n) is the decimal representation of the binary number with string structure 10s00, s in {0,1}*, such that it results in a non-palindromic cycle of length 4 in the Reverse and Add! procedure in base 2 and is not in the trajectory of any m < a(n).at n=20A306516