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10_summation_of_primes.rb
10_summation_of_primes.rb
 
 
119_digit_power_sum.rb
119_digit_power_sum.rb
 
 
120_square_remainders.rb
120_square_remainders.rb
 
 
125_palindromic_sums.rb
125_palindromic_sums.rb
 
 
12_highly_divisible_triangle_number.rb
12_highly_divisible_triangle_number.rb
 
 
13_large_sum.rb
13_large_sum.rb
 
 
14_longest_collatz_sequence.rb
14_longest_collatz_sequence.rb
 
 
15_lattice_paths.rb
15_lattice_paths.rb
 
 
16_power_digit_sum.rb
16_power_digit_sum.rb
 
 
17_number_letter_counts.rb
17_number_letter_counts.rb
 
 
19_counting_sundays.rb
19_counting_sundays.rb
 
 
1_multiples_of_3_and_5.rb
1_multiples_of_3_and_5.rb
 
 
20_factorial_digit_sum.rb
20_factorial_digit_sum.rb
 
 
22_names_score.rb
22_names_score.rb
 
 
24_lexicographic_permutations.rb
24_lexicographic_permutations.rb
 
 
25_thousand_digit_fibonacci_number.rb
25_thousand_digit_fibonacci_number.rb
 
 
27_quadratic_primes.rb
27_quadratic_primes.rb
 
 
29_distinct_powers.rb
29_distinct_powers.rb
 
 
2_even_fibonacci_numbers.rb
2_even_fibonacci_numbers.rb
 
 
30_digit_fifth_powers.rb
30_digit_fifth_powers.rb
 
 
33_digit_cancelling_fractions.rb
33_digit_cancelling_fractions.rb
 
 
34_digit_factorials.rb
34_digit_factorials.rb
 
 
35_circular_primes.rb
35_circular_primes.rb
 
 
36_double_base_palindromes.rb
36_double_base_palindromes.rb
 
 
37_truncatable_primes.rb
37_truncatable_primes.rb
 
 
38_pandigital_multiples.rb
38_pandigital_multiples.rb
 
 
39_integer_right_triangles.rb
39_integer_right_triangles.rb
 
 
3_largest_prime_factor.rb
3_largest_prime_factor.rb
 
 
41_pandigital_prime.rb
41_pandigital_prime.rb
 
 
42_coded_triangle_numbers.rb
42_coded_triangle_numbers.rb
 
 
43_substring_divisibility.rb
43_substring_divisibility.rb
 
 
44_pentagon_numbers.rb
44_pentagon_numbers.rb
 
 
45_triangular.rb
45_triangular.rb
 
 
46_goldbach.rb
46_goldbach.rb
 
 
47_distinct_prime_factors.rb
47_distinct_prime_factors.rb
 
 
48_self_powers.rb
48_self_powers.rb
 
 
49_prime_permutations.rb
49_prime_permutations.rb
 
 
4_largest_palindrome_product.rb
4_largest_palindrome_product.rb
 
 
52_permuted_multiples.rb
52_permuted_multiples.rb
 
 
53_combinatoric_selections.rb
53_combinatoric_selections.rb
 
 
55_lychrel_numbers.rb
55_lychrel_numbers.rb
 
 
56_powerful_digit_sum.rb
56_powerful_digit_sum.rb
 
 
63_powerful_digit_counts.rb
63_powerful_digit_counts.rb
 
 
6_sum_square_difference.rb
6_sum_square_difference.rb
 
 
74_digit_factorial_chains.rb
74_digit_factorial_chains.rb
 
 
7_10001st_prime.rb
7_10001st_prime.rb
 
 
80_square_root_digital_expansion.rb
80_square_root_digital_expansion.rb
 
 
85_counting_rectangles.rb
85_counting_rectangles.rb
 
 
8_largest_product_in_a_series.rb
8_largest_product_in_a_series.rb
 
 
92_square_digit_chains.rb
92_square_digit_chains.rb
 
 
99_largest_exponential.rb
99_largest_exponential.rb
 
 
9_special_pythagorean_triplet.rb
9_special_pythagorean_triplet.rb
 
 
README.md
README.md
 
 
base_exp.txt
base_exp.txt
 
 
names.txt
names.txt
 
 
words.txt
words.txt
 
 

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Solutions in Ruby to selected Project Euler problems.

A few of them include tail-recursive methods, which make use of tail call optimzation (TCO). One must enable TCO before using it since Ruby MRI disables this functionality by default. Here's a comprehensive take on tail call optimization in Ruby.

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