The nth triangular number is the sum of the first n positive integers. The sequence of triangular numbers starts 1, 3, 6, 10, 15, and 21. These numbers are involved in Cody Problems 5, 291, 44289, 44334, 44732, 55680, 55695, 55705, 55710, and 55715, for example.
Write a function to return the sum of the non-triangular numbers between the nth and (n+1)st triangular numbers. For example, if n = 3, then the function should return 7+8+9 = 24. Beware the banned functions.
Solve

Solution Stats

29 Solutions

14 Solvers

Last Solution submitted on Mar 04, 2026

Last 200 Solutions

Solution Comments

Show comments

Problem Recent Solvers14

Jean-Marie Sainthillier Pauli Huusari Tomoaki Takagi Lorenzo

Suggested Problems

More from this Author323

Problem Tags

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!