Fatto matematico: 1505 is the number of necklaces possible with 6 beads, each being one of 5 colors.
Trivia: 1505 is a boring number.
Data storica: February 13th is the day in 1961 that a 500,000-year-old rock is discovered near Olancha, California, US, that appears to anachronistically encase a spark plug.