Tool (algorithm) to invalidate the Polya conjecture. Polya's conjecture suggests that the majority of the prime factor numbers of numbers less than a precise integer is odd.

Pólya Conjecture - dCode

Tag(s) : Arithmetics, Algorithm

dCode is free and its tools are a valuable help in games, maths, geocaching, puzzles and problems to solve every day!

A suggestion ? a feedback ? a bug ? an idea ? *Write to dCode*!

In number theory, Pólya's conjecture, proposed by the Hungarian mathematician George Pólya in 1919, states that for any integer $ N $, in the decomposition into prime factors of all natural integers less than $ N $, there are more decompositions with an odd number of factors than decompositions with an even number of factors.

This conjecture is false, the first counterexample is $ N = 906150257 $

To prove that a conjecture is true, a rigorous mathematical proof is needed. To prove that the conjecture is false, it is enough to give one counter-example.

__Example:__ For $ N = 10 $, there are 5 decompositions with an odd number of factors: $ 8, 7, 5, 3, 2 $, and 4 decompositions with an even number of factors: $ 9, 6, 4, 1 $. Since $ 5 > 4 $, the conjecture is true for $ N = 10 $, but this does not mean that it is true for all $ N $.

The Polya conjecture was refuted in 1958, so it is false. The smallest counterexample is the number $ 906150257 $.

The algorithm corresponding to the verification of the conjecture is similar to the following:`// Javascript`

var even = 1;

var odd = 0;

var d = new Array();

for (i = 2; i < 4000000000; i++) {

d = prime_factor_decomposition(i); // return a table with all factors

if (d.length % 2) odd++;

else even++;

if (even > odd) {

alert(i);

break;

}

dCode retains ownership of the "Pólya Conjecture" source code. Except explicit open source licence (indicated Creative Commons / free), the "Pólya Conjecture" algorithm, the applet or snippet (converter, solver, encryption / decryption, encoding / decoding, ciphering / deciphering, breaker, translator), or the "Pólya Conjecture" functions (calculate, convert, solve, decrypt / encrypt, decipher / cipher, decode / encode, translate) written in any informatic language (Python, Java, PHP, C#, Javascript, Matlab, etc.) and all data download, script, or API access for "Pólya Conjecture" are not public, same for offline use on PC, mobile, tablet, iPhone or Android app!

Reminder : dCode is free to use.

The copy-paste of the page "Pólya Conjecture" or any of its results, is allowed (even for commercial purposes) as long as you credit dCode!

Exporting results as a .csv or .txt file is free by clicking on the *export* icon

Cite as source (bibliography):

*Pólya Conjecture* on dCode.fr [online website], retrieved on 2024-09-14,

polya,prime,factor,decomposition,odd,even,906150257

https://www.dcode.fr/polya-conjecture

© 2024 dCode — El 'kit de herramientas' definitivo para resolver todos los juegos/acertijos/geocaching/CTF.

Feedback