Folder 1: Letter from Marie Heaney, Commissioning Editor of 'Town House and Country House', inviting Robinson to write an essay on a topic that has given him spiritual sustenance for a book called 'Sources' in aid of Focus Ireland. Robinson's submission is included - handwritten and typed, on the sequence of prime numbers.
Folder 2: Correspondence with Dr John Cosgrave from the Department of Mathematics at St Patrick's College in Drumcondra who discovered a Prime Number with 2,000 digits. Folding Landscapes published 'A Prime for the Millennium', and the file discusses the publication, their mutual love of mathematics, press cuttings about the project, and a letter from John Banville declining to launch the book on the grounds of his fluency in mathematics.