The first few pronic numbers are::0, 2, 6, 12, 20, 30, 42, 56, 72, 90, 110, 132, 156, 182, 210, 240, 272, 306, 342, 380, 420, 462 …These numbers are sometimes called "oblong" because they are analogous to polygonal numbers in this way:Pronic numbers can also be expressed as "n"² + "n".
Несколько первых прямоугольных чисел ():: 0, 2, 6, 12, 20, 30, 42, 56, 72, 90, 110, 132, 156, 182, 210, 240, 272, 306, 342, 380, 420, 462 …Прямоугольные числа можно представить как "n"² + "n".