Each number is in the following sequence: 1, 3, 6, 10, 15, 21, 28, 36, 45, etc. The dots represent the numbers the triangular pattern contains. A sequence of triangular numbers is formed when the previous number is added to the order of the succeeding number. This article explains more about that.. Triangular numbers correspond to the first-degree case of Faulhaber's formula . Alternating triangular numbers (1, 6, 15, 28,.) are also hexagonal numbers. Every even perfect number is triangular (as well as hexagonal), given by the formula. where Mp is a Mersenne prime.
Auriezvous une idée 'lumineuse', pour trouver le nombre logique qui suit cette étrange série

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The last sequence you will explore in our number sequence calculator is the star numbers, another class of figurate numbers where each term indicates the size of a collection of items you can arrange in a six-pointed star fashion. There is a neat formula to calculate the nth term of this sequence: s_n = 6\cdot n \cdot (n-1) + 1 sn = 6 ⋅ n ⋅.. Mathemetic series 1, 3, 6, 10, 15, 21, 28, 36, 45,__? [closed] Ask Question Asked 6 years, 7 months ago. Modified 6 years, 7 months ago. Viewed 3k times -6 $\begingroup$ Closed. This question is off-topic. It is not currently accepting answers..