An effective p-adic analogue of a theorem of Thue II. The greatest prime factor of a binary form
"Ramanujan's 6-10-8 identity" inspired Hirschhorn to formulate his "3-7-5 identity". Now, we give a new "6-14-10 identity" which we suppose Ramanujan would have discovered but missed to mention in his notebooks.
We give a survey of methods used to connect the study of ternary diophantine equations to modern techniques coming from the theory of modular forms.