196447domain: NAppears in sequencesa(n) = F(n+3) + c(n) where F(k) is k-th Fibonacci number and c(n) is n-th number that is 1 or 2 or is not a Fibonacci number.at n=23A022809Beginning of a run of 4 consecutive Niven (or Harshad) numbers.at n=25A141769