# F - [Factor-perfect numbers](/sidef-lang/programming_tasks/f/factor-perfect_numbers.md) - [Factorial](/sidef-lang/programming_tasks/f/factorial.md) - [Factorial primes](/sidef-lang/programming_tasks/f/factorial_primes.md) - [Factorions](/sidef-lang/programming_tasks/f/factorions.md) - [Factors of a Mersenne number](/sidef-lang/programming_tasks/f/factors_of_a_mersenne_number.md) - [Factors of an integer](/sidef-lang/programming_tasks/f/factors_of_an_integer.md) - [Fairshare between two and more](/sidef-lang/programming_tasks/f/fairshare_between_two_and_more.md) - [Farey sequence](/sidef-lang/programming_tasks/f/farey_sequence.md) - [Fast Fourier transform](/sidef-lang/programming_tasks/f/fast_fourier_transform.md) - [FASTA format](/sidef-lang/programming_tasks/f/fasta_format.md) - [Faulhaber's formula](/sidef-lang/programming_tasks/f/faulhabers_formula.md) - [Faulhaber's triangle](/sidef-lang/programming_tasks/f/faulhabers_triangle.md) - [Feigenbaum constant calculation](/sidef-lang/programming_tasks/f/feigenbaum_constant_calculation.md) - [Fermat numbers](/sidef-lang/programming_tasks/f/fermat_numbers.md) - [Fermat pseudoprimes](/sidef-lang/programming_tasks/f/fermat_pseudoprimes.md) - [Fibonacci matrix-exponentiation](/sidef-lang/programming_tasks/f/fibonacci_matrix-exponentiation.md) - [Fibonacci n-step number sequences](/sidef-lang/programming_tasks/f/fibonacci_n-step_number_sequences.md) - [Fibonacci sequence](/sidef-lang/programming_tasks/f/fibonacci_sequence.md) - [Fibonacci word](/sidef-lang/programming_tasks/f/fibonacci_word.md) - [Fractal](/sidef-lang/programming_tasks/f/fibonacci_word/fractal.md) - [File extension is in extensions list](/sidef-lang/programming_tasks/f/file_extension_is_in_extensions_list.md) - [File input](/sidef-lang/programming_tasks/f/file-input.md) - [Output](/sidef-lang/programming_tasks/f/file-input/output.md) - [File modification time](/sidef-lang/programming_tasks/f/file_modification_time.md) - [File size](/sidef-lang/programming_tasks/f/file_size.md) - [File size distribution](/sidef-lang/programming_tasks/f/file_size_distribution.md) - [Filter](/sidef-lang/programming_tasks/f/filter.md) - [Find adjacent primes which differ by a square integer](/sidef-lang/programming_tasks/f/find_adjacent_primes_which_differ_by_a_square_integer.md) - [Find common directory path](/sidef-lang/programming_tasks/f/find_common_directory_path.md) - [Find duplicate files](/sidef-lang/programming_tasks/f/find_duplicate_files.md) - [Find first and last set bit of a long integer](/sidef-lang/programming_tasks/f/find_first_and_last_set_bit_of_a_long_integer.md) - [Find first missing positive](/sidef-lang/programming_tasks/f/find_first_missing_positive.md) - [Find largest left truncatable prime in a given base](/sidef-lang/programming_tasks/f/find_largest_left_truncatable_prime_in_a_given_base.md) - [Find limit of recursion](/sidef-lang/programming_tasks/f/find_limit_of_recursion.md) - [Find palindromic numbers in both binary and ternary bases](/sidef-lang/programming_tasks/f/find_palindromic_numbers_in_both_binary_and_ternary_bases.md) - [Find prime n such that reversed n is also prime](/sidef-lang/programming_tasks/f/find_prime_n_such_that_reversed_n_is_also_prime.md) - [Find prime numbers of the form n\*n\*n 2](/sidef-lang/programming_tasks/f/find_prime_numbers_of_the_form_n-n-n_2.md) - [Find square difference](/sidef-lang/programming_tasks/f/find_square_difference.md) - [Find squares n where n 1 is prime](/sidef-lang/programming_tasks/f/find_squares_n_where_n_1_is_prime.md) - [Find the intersection of a line with a plane](/sidef-lang/programming_tasks/f/find_the_intersection_of_a_line_with_a_plane.md) - [Find the intersection of two lines](/sidef-lang/programming_tasks/f/find_the_intersection_of_two_lines.md) - [Find the last Sunday of each month](/sidef-lang/programming_tasks/f/find_the_last_sunday_of_each_month.md) - [Find the missing permutation](/sidef-lang/programming_tasks/f/find_the_missing_permutation.md) - [Find words whose first and last three letters are equal](/sidef-lang/programming_tasks/f/find_words_whose_first_and_last_three_letters_are_equal.md) - [First-class functions](/sidef-lang/programming_tasks/f/first-class_functions.md) - [Use numbers analogously](/sidef-lang/programming_tasks/f/first-class_functions/use_numbers_analogously.md) - [First 9 prime Fibonacci number](/sidef-lang/programming_tasks/f/first_9_prime_fibonacci_number.md) - [First class environments](/sidef-lang/programming_tasks/f/first_class_environments.md) - [First missing positive](/sidef-lang/programming_tasks/f/first_missing_positive.md) - [First perfect square in base n with n unique digits](/sidef-lang/programming_tasks/f/first_perfect_square_in_base_n_with_n_unique_digits.md) - [First power of 2 that has leading decimal digits of 12](/sidef-lang/programming_tasks/f/first_power_of_2_that_has_leading_decimal_digits_of_12.md) - [Five weekends](/sidef-lang/programming_tasks/f/five_weekends.md) - [Fivenum](/sidef-lang/programming_tasks/f/fivenum.md) - [FizzBuzz](/sidef-lang/programming_tasks/f/fizzbuzz.md) - [Flatten a list](/sidef-lang/programming_tasks/f/flatten_a_list.md) - [Flow-control structures](/sidef-lang/programming_tasks/f/flow-control_structures.md) - [Floyd's triangle](/sidef-lang/programming_tasks/f/floyds_triangle.md) - [Floyd-Warshall algorithm](/sidef-lang/programming_tasks/f/floyd-warshall_algorithm.md) - [Forbidden numbers](/sidef-lang/programming_tasks/f/forbidden_numbers.md) - [Forest fire](/sidef-lang/programming_tasks/f/forest_fire.md) - [Fork](/sidef-lang/programming_tasks/f/fork.md) - [Formatted numeric output](/sidef-lang/programming_tasks/f/formatted_numeric_output.md) - [Fortunate numbers](/sidef-lang/programming_tasks/f/fortunate_numbers.md) - [Forward difference](/sidef-lang/programming_tasks/f/forward_difference.md) - [Four bit adder](/sidef-lang/programming_tasks/f/four_bit_adder.md) - [Four is magic](/sidef-lang/programming_tasks/f/four_is_magic.md) - [Four sides of square](/sidef-lang/programming_tasks/f/four_sides_of_square.md) - [Fractal tree](/sidef-lang/programming_tasks/f/fractal_tree.md) - [Fractran](/sidef-lang/programming_tasks/f/fractran.md) - [Free polyominoes enumeration](/sidef-lang/programming_tasks/f/free_polyominoes_enumeration.md) - [French Republican calendar](/sidef-lang/programming_tasks/f/french_republican_calendar.md) - [Frobenius numbers](/sidef-lang/programming_tasks/f/frobenius_numbers.md) - [FTP](/sidef-lang/programming_tasks/f/ftp.md) - [Function composition](/sidef-lang/programming_tasks/f/function_composition.md) - [Function definition](/sidef-lang/programming_tasks/f/function_definition.md) - [Function frequency](/sidef-lang/programming_tasks/f/function_frequency.md) - [Fusc sequence](/sidef-lang/programming_tasks/f/fusc_sequence.md)