List questions from triangular-numbers | MathQA

How do I calculate the sum of sum of triangular numbers?

Published on 25 Jun 2021 - 14:55

Find $f(n)$, a polynomial of degree<10 on the integers with rational coefficients such that $f(n)$ is an integer both triangular and square.

Published on 14 Aug 2021 - 15:59

Reference: the first $m$ triangular numbers are a complete residue system modulo $m$ iff $m$ is a power of $2$

Published on 05 Jan 2022 - 21:09

Simplifying the alternating sum of n squares

Published on 06 Feb 2022 - 11:25

Representing the cube of any natural number as a sum of odd numbers

Published on 06 Feb 2022 - 23:46

Perfect numbers and Pell's equation

Published on 07 Feb 2022 - 3:37

$T_U - T_V$ is not triangular when $U = V+2$

Published on 07 Feb 2022 - 4:17

Closed Form for an Expression Involving the Smallest Triangular Number Not Exceeding a Given Integer

Published on 05 Mar 2022 - 4:32

Will there always be prime numbers of the form $X_i =i^2+i+1$?

Published on 20 Jun 2022 - 0:46

Reciprocal sum of triangular numbers is 1.

Published on 01 Sep 2022 - 18:30