161647

Appears in sequences

• Composite numbers not divisible by 7 which in base 7 contain their largest proper factor as a substring.at n=14A063877
• Number of nX1 0..3 arrays with every element value z a city block distance of exactly z from another element value z.at n=14A209173
• a(n) = n*a(n-1) - a(n-2) + a([n/2]), where a(0) = 1, a(1) = 1, a(2) = 1.at n=9A298419