User contributions for 79.201.90.172

31 October 2019

• 10:2210:22, 31 October 2019 diff hist +8,152‎ N Pronic number ‎ →‎Additional properties: One does not need that a pronic number is the sum of even numbers to see that it is even. It is immediate that it is even, since it is the producat...t n(n+1) and one or the other of these factors is even. current