Bases and palindromes

Walkthrough of Project Euler problem #36

Spiral square diagonals

Walkthrough of Project Euler problem #28

The last digits of large numbers

Walkthrough of Project Euler problem #48

Repeating decimals

Walkthrough of Project Euler problem #26

BigInteger laziness

Walkthrough of Project Euler problem #25

Sorted permutations

Walkthrough of Project Euler problem #24

Abundant numbers

Walkthrough of Project Euler problem #23

Amicable pairs

Walkthrough of Project Euler problem #12

Numeric character manipulation

Walkthrough of Project Euler problem #22

Sunday the 1st

Walkthrough of Project Euler problem #19

Paths down a triangle, continued

Walkthrough of Project Euler problem #67

Problem 18

Walkthrough of Project Euler problem #18