Fatto matematico: 2587 is a value of n for which f(n) + f(n+1) divides s(n) + s(n+1).
Trivia: 2587 is an unremarkable number.
Data storica: January 30th is the day in 1971 that Carole King's Tapestry album is released, it would become the longest charting album by a female solo artist and sell 24 million copies worldwide.