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Name: Alex Landherr

Type: User

Bio: Programmer learning Python (on Raspberry Pi:s & other systems), Java (on Windows 10) & C++ on Linux.

Twitter: AlexLandherr

Location: Sweden

Alex Landherr's Projects

007_ascii

Program that prints out the 007 James Bond logo in a terminal.

amicable_sum

Evaluate the sum of all the amicable numbers under 10000.

bin_dec_palindrome

Find the sum of all numbers, less than one million, which are palindromic in base 10 and base 2.

circular_primes

How many circular primes are there below one million?

concat_prod

What is the largest 1 to 9 pandigital 9-digit number that can be formed as the concatenated product of an integer with (1, 2,...,n) where n > 1?

denom_val

Find the denominator of the product of the four non-trivial fractions when said product is expressed in its lowest common terms.

diagonal_spiral_sum

What is the sum of the numbers on the diagonals in a 1001 by 1001 spiral formed in the same way?

digit_sum

2^15 = 32768 and the sum of the digits is 3+2+7+6+8 = 26. What is the sum of the digits of the number 2^1000?

dist_terms

How many distinct terms are in the sequence generated by a^b for 2 ≤ a ≤ 100 and 2 ≤ b ≤ 100?

div_range

What is the smallest number that can be divided by each of the numbers from 1 through 20 without a remainder?

factorial_digit_sum

Find the sum of the digits in the number 100!.

factorial_sum

Find the sum of all numbers which are equal to the sum of the factorial of their digits.

fibonacci_digit_count

What is the index of the first term in the Fibonacci sequence to contain 1000 digits?

fibonacci_sum

What is the sum of all even Fibonacci numbers less than 4,000,000?

file_gen

Simple tool to generate test file of given size in bytes.

first_sum

Work out the first ten digits of the sum of the following one-hundred 50-digit numbers.

greatest_product

Find the thirteen (13) adjacent digits in the 1000-digit number that have the greatest product. What is the value of this product?

grid_product

What is the greatest product of four adjacent numbers in the same direction (up, down, left, right or diagonally) in the 20x20 grid?

Starting in the top left corner of a 2x2 grid, and only being able to move to the right and down, there are exactly 6 routes to the bottom right corner. How many such routes are there through a 20x20 grid?

js-to-do-website

Simple little JavaScript & HTML/CSS website letting you create, complete, remove and restore to-do items.

longest_chain

Which starting number, under one million, produces the longest chain?

multiple_sum

What is the sum of the multiples of 3 or 5 under 1000?

name_scores

What is the total of all the name scores in the file?

non_abundant_sum

Find the sum of all the positive integers which cannot be written as the sum of two abundant numbers.

nth_permutation

What is the millionth lexicographic permutation of the digits 0, 1, 2, 3, 4, 5, 6, 7, 8 and 9?

nth_prime

What is the 10,001st prime number?

palindrome_num

Find the largest palindrome number that is a product of two three-digit numbers.

pandigital_prod_sum

Find the sum of all products whose multiplicand/multiplier/product identity can be written as a 1 through 9 pandigital.

passcode_gen

Tool to generate random 4 digit passcodes.

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