欧拉计划

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完整版题解
1. Multiples of 3 and 5
2. Even Fibonacci numbers
3. Largest prime factor
4. Largest palindrome product
5. Smallest multiple
6. Sum square difference
7. 10001st prime
8. Largest product in a series
9. Special Pythagorean triplet
10. Summation of primes
11. Largest product in a grid
12. Highly divisible triangular number
13. Large sum
14. Longest Collatz sequence
15. Lattice paths
16. Power digit sum
17. Number letter counts
18. Maximum path sum I
19. Counting Sundays
20. Factorial digit sum
21. Amicable numbers
22. Names scores
23. Non-abundant sums
24. Lexicographic permutations
25. 1000-digit Fibonacci number
26. Reciprocal cycles
27. Quadratic primes
28. Number spiral diagonals
29. Distinct powers
30. Digit fifth powers
31. Coin sums
32. Pandigital products
33. Digit cancelling fractions
34. Digit factorials
35. Circular primes
36. Double-base palindromes
37. Truncatable primes
38. Pandigital multiples
39. Integer right triangles
40. Champernowne’s constant
41. Pandigital prime
42. Coded triangle numbers
43. Sub-string divisibility
44. Pentagon numbers
45. Triangular, pentagonal, and hexagonal
46. Goldbach’s other conjecture
47. Distinct primes factors
48. Self powers
49. Prime permutations
50. Consecutive prime sum
51. Prime digit replacements
52. Permuted multiples