516790

Appears in sequences

• Edge-rooted tree-like octagonal systems (see the Cyvin et al. reference for precise definition).at n=7A121112
• a(n) is the smallest number greater than a(n-1) such that in a(1) through a(n) no digit occurs more than once more than any other digit, starting with a(1) = 1.at n=52A248651