Here are the first 5 terms of a quadratic sequence.
5 7 11 17 25
Show that the n n\,nth term is n2−n+5n^2 - n + 5n2−n+5
Hence, determine whether 137 is a term in the sequence.
201 exam-style questions on OCR GCSE Maths The Nth Term of a Quadratic Sequence. Each one has a worked solution and a mark scheme showing where the marks go.