Ramanujan graphs in cryptography (A. Costache, B. Feigon, K. Lauter, M. Massierer, A. Puskás).- Cycles in the supersingular l-isogeny graph and corresponding endomorphisms (E. Bank, C. Camacho-Navarro, K. Eisentraeger, T. Morrison, J. Park).- Chabauty-Coleman experiments for genus 3 curves (J.S. Balakrishnan, F. Bianchi, V. Cantoral-Farfán, M. Çiperiani, A. Etropolski).- Weierstrass equations for the elliptic fibrations of a K3 surface (O. Lecacheux).- Newton polygons of cyclic covers of the projective line branched at three points (Wanlin Li, Elena Mantovan, Rachel Pries, Yunqing Tang).- Arboreal representations for rational maps with few critical points (J. Juul, H. Krieger, N. Looper, M. Manes, B. Thompson, L. Walton).- Dessins d'enfants for single-cycle Belyi maps (M. Manes, G. Melamed, B. Tobin).- Multiplicative order and Frobenius symbol for the reductions of number fields (A. Perucca).- Quantam modular forms and singular combinatorial series with distinct roots of unity (A.Folsom, M.-J. Jang, S. Kimport, H. Swisher).
