402859

Properties

Appears in sequences

• a(1) = 1; for n>1, a(n) = the largest prime divisor of the number C(n) formed from the concatenation of n, n-1, n-2, n-3, ... down to 1.at n=6A075021
• a(1) = 1, a(n) = the largest prime divisor of A138793(n).at n=6A138963
• Prime numbersat n=34069