How does java judge whether it is a Pentagon number?

This article mainly introduces java how to judge whether the pentagonal number, has a certain reference value, interested friends can refer to, I hope you can learn a lot after reading this article, the following let the editor take you to understand it.

The pentagonal number is generated by the formula Pn=n (3n − 1) / 2. The first ten pentagonal numbers are:

1, 5, 12, 22, 35, 51, 70, 92, 117, 145,...

We can see that P4 + P7 = 22 + 70 = 92 = P8. However, their difference of 70 − 22 = 48 is not a pentagonal number.

In the Pj and competition of Pentagon numbers in which all sum and difference are pentagonal numbers, find the pair that makes D = | compete − Pj | the smallest pair; what is the value of D at this time?

System.out.println (subStringDivisibility ())

Parsing:

Start from the smallest to the full number.

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