Saranya , C., G. Janaki, and P. Chitra. “Some Non-Extendable Special Dio 3-Tuples Involving Heptagonal Pyramidal Numbers”. Explorations in Diophantine Equations (November 11, 2023): 37–49. Accessed June 19, 2026. https://stm.bookpi.org/EDE/article/view/12432.