Fatto matematico: 7551 is a value of n for which f(n) + f(n+1) divides s(n) + s(n+1).
Trivia: 7551 is an unremarkable number.
Data storica: September 2nd is the day in 421 that Emperor Constantius III dies suddenly of an illness, his wife Galla Placidia becomes for the second time widow.