Counting Primitive Pythagorean Triples

A Pythagorean triple consists of three positive integers $a, b$ and $c$ satisfying $a^2+b^2=c^2$.
The triple is called primitive if $a, b$ and $c$ are relatively prime.
Let $P(n)$ be the number of primitive Pythagorean triples with $a \lt b \lt c \le n$.
For example $P(20) = 3$, since there are three triples: $(3,4,5)$, $(5,12,13)$ and $(8,15,17)$.

You are given that $P(10^6) = 159139$.
Find $P(3141592653589793)$.

To find the value of $P(3141592653589793)$, we can use a Python program to calculate it.

First, let’s define a function to check if two numbers are relatively prime:

import math

def is_relatively_prime(x, y):
return math.gcd(x, y) == 1

Next, we’ll define a function to count the number of primitive Pythagorean triples up to a given limit:

def count_primitive_triplets(limit):
count = 0
for a in range(2, limit + 1):
for b in range(a + 1, limit + 1):
c = math.sqrt(a**2 + b**2)
if c.is_integer() and c <= limit and is_relatively_prime(a, b): count += 1 return count ``` Finally, we can calculate the value of $P(3141592653589793)$ using the `count_primitive_triplets` function: ```python limit = 3141592653589793 result = count_primitive_triplets(limit) print(result) ``` When we run this program, it will output the value of $P(3141592653589793)$. Note: Running this program will take a considerable amount of time since the limit is very large. You may want to consider using a more efficient algorithm or optimizing the program further if you're working with such large inputs.

More Answers:
Modulo Power Identity
Maximum Quadrilaterals
Odd Elimination

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