Frontmatter -- Table of contents -- The Finite Heine Transformation -- Finding Almost Squares III -- Sums and Differences of the Coordinates of Points on Modular Hyperbolas -- Self Generating Sets and Numeration Systems -- Small Sets Satisfying the Central Sets Theorem -- Column-to-Row Operations on Partitions: The Envelopes -- On the Euler Product of Some Zeta Functions -- On the Range of the Iterated Euler Function -- Frobenius Numbers of Generalized Fibonacci Semigroups -- Combinatorics of Ramanujan-Slater Type Identities -- A Mock Theta Function for the Delta-function -- On the Density of Integral Sets with Missing Differences -- On Pseudosquares and Pseudopowers -- Maier Matrices Beyond Z -- Linear Equations Involving Iterates of σ (N) -- Heron Sequences and Their Modifications -- Backmatter.