Friday the 13th Calculator v0.01

This is just a sketch code
Work in Progress...
It might not work as desired

[30.11.2025 script code can be edited for desire with special web browsers which have developer tools]

Start Year
1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 2026 2027 2028 2029 2030 2031 2032 2033 2034 2035 2036 2037 2038 2039 2040 2041 2042 2043 2044 2045 2046 2047 2048 2049 2050 2051 2052 2053 2054 2055 2056 2057 2058 2059 2060 2061 2062 2063 2064 2065 2066 2067 2068 2069 2070 2071 2072 2073 2074 2075 2076 2077
End Year
1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 2026 2027 2028 2029 2030 2031 2032 2033 2034 2035 2036 2037 2038 2039 2040 2041 2042 2043 2044 2045 2046 2047 2048 2049 2050 2051 2052 2053 2054 2055 2056 2057 2058 2059 2060 2061 2062 2063 2064 2065 2066 2067 2068 2069 2070 2071 2072 2073 2074 2075 2076 2077

1996 - 9991

Example of possible permutations

1996
1999
6166
6169
6196
6199
6616
6619
6691
6916
6919
6961
6991
9166
9169
9196
9199
9616
9619
9661
9691
9916
9919
9961
9991

Snippet of py code

import itertools

a = list("1996")
b = []

for i in itertools.permutations(a):

    ii = "".join(i)

    if 1996 > int(ii):
        continue

    if "6"*3 in ii:
      continue

    if ii in b:
        continue
    b.append(ii)
print("\n".join(sorted(b)))
print(len(b))
#beta version
#beginner friendly
#does not follows all given rules
#18.11.2025 by Skeleton3Skeletor33

Flattening list in Python by CoPilot

def flat_arr(li):

    result = []

    for item in li:

        if isinstance(item, list) or isistance(item, tuple):

            result.extend(flat_arr(item))

        else:

            result.append(item)

    return result

li = [[[0],1,["B","@"]], 6, 7, [1, 0.9]]

a = flat_arr(li)

print(a)