Solution to Project Euler Problem 28: Number spiral diagonals - Starting with the number 1 and moving to the right in a clockwise direction a 5 by 5 spiral is formed as follows: It can be verified that the sum of the numbers on the diagonals is 101. What is the sum of the numbers on the diagonals in a 1001 by 1001 spiral formed in the same way?


Updated: Oct. 19, 2021 — Training Time: 2 minutes
Overseen by: Archangel Macsika
All Training Resources

Scroll for more menu list

Topic: Project Euler Problem 28: Number spiral diagonals.

Difficulty: Easy.

Objective: Starting with the number 1 and moving to the right in a clockwise direction a 5 by 5 spiral is formed as follows:
21 22 23 24 25
20  7   8    10
19  6     2  11
18  5   4   3  12
17 16 15 14 13
It can be verified that the sum of the numbers on the diagonals is 101.
What is the sum of the numbers on the diagonals in a 1001 by 1001 spiral formed in the same way?

Input: None.

Expected Output: 669171001.

Sikademy Solution in Java Programming Language

Sikademy Solution in Python Programming Language

Was this training resource helpful?