This is the triangular nu
This is the triangular number between fifteen and twenty-eight and the number in the Fibonacci sequence between thirteen and thirty-four. It also is equal to the number of different sums that are possible when you roll four standard dice. It is the solution to the equations x squared minus forty-two x plus four hundred forty-one equals zero and the equation log x equals log three plus log seven. Find this number equal to the eleventh term in the sequence that begins one, three, five, seven, etcetera.
This is the triangular number between fifteen and twenty-eight and the number in the Fibonacci sequence between thirteen and thirty-four.
21