How many times has August 13 fallen on a Friday since 1873?

Since 1873, August 13 has fallen on a Friday 17 times. The occurrences are in the years: 1874, 1880, 1886, 1891, 1897, 1908, 1915, 1920, 1926, 1937, 1943, 1948, 1954, 1965, 1971, 1976, 1982, and 2021. The pattern can be determined using a perpetual calendar or a software tool for date calculations.