The second and third rectangular numbers are 6 and 12
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There is no such formula. Rectangular numbers are composite numbers and there is no known formula that will generate either composite numbers or prime numbers.
42
101
Rectangular numbers are numbers that can be represented as a rectangle with a whole number of rows and columns. In this case, the rectangular numbers between 11 and 17 are 12 and 16. The number 12 can be represented as a 3x4 rectangle, and the number 16 can be represented as a 4x4 square.
50th or Fiftieth Ordinal numbers are just numbers that identify the order of things: 1st (first), 2nd (second), 3rd (third), 4th (fourth), etc.