### Euler Problem 21: Amicable Numbers

A solution in the R language to Euler Problem 21 which asks to evaluate the sum of all the amicable, or friendly, numbers under 10000. ... Read More

### Euler Problem 20: Large Integer Factorials

A proposed solution in the R language to Euler Problem 20: Find the sum of the digits in the faculty of 100: 100 × 99 × ... × 3 × 2 × 1... Read More

### Euler Problem 19: Counting Sundays — When does the week start?

Solution in R to Euler Problem 19: How many Sundays fell on the first of the month during the twentieth century (1 Jan 1901 to 31 Dec 2000)?... Read More

### Euler Problem 18 and 67: Maximum Path Sums

Proposed solution to Euler Problem 18 in the R language. Find the maximum total from top to bottom of a triangle consisting of numbers.... Read More

### Euler Problem 17: Number Letter Counts In various languages

A solution in the R language to Euler Problem 17: If all the numbers from 1 to 1000 inclusive were written out in words, how many letters would be used?... Read More

### Euler Problem 16: Power Digit Sum

A solution in the R language to Euler Problem 16. What is the sum of the digits of the number 2^1000? This post provides a solution using basic R code.... Read More

### Euler Problem 15: Pathways Through a Lattice – Taxicab geometry

Solution in the R language to project Euler Problem 15. The problem asks to calculate the number of pathways through a 20 by 20 grid.... Read More

### Euler Problem 14: Find the Longest Collatz Sequence

Solution to Euler Problem 14 in the R language: Which starting number, under one million, produces the longest Collatz sequence?... Read More

### Euler Problem 13: Adding a Large Sum of 1000 Digits

Euler Problem 13 asks to add one hundred numbers with fifty digits. This seems like a simple problem where it not that most computers are not designed to deal with numbers with a lot of integers. This... Read More

### Euler Problem 12: Highly Divisible Triangular Number

Proposed solution for Euler Problem 12 in the R language. What is the value of the first triangle number to have over five hundred divisors?... Read More

### Euler Problem 11: Largest Product in a Grid

Solution to Euler Problem 11 in the R language. What is the greatest product of four adjacent numbers in the same direction in the 20 by 20 grid?... Read More

### Euler Problem 10: Summation of Primes

A solution in the R language for statistical computing to find the solution the Euler Problem 10: Find the sum of all primes below two million.... Read More