746607domain: NAppears in sequencesa(n) = 10 + floor( (1 + Sum_{j=1..n-1} a(j) )/3 ).at n=39A120155Composite Flavius' numbers (A000960) whose divisors are again Flavius' numbers.at n=10A181488Composite Flavius' numbers (A000960) whose prime factors are again Flavius' numbers.at n=20A181489