Interestingness score
How we rank numbers on NumDic
How it’s calculated
Each number gets a score from the properties shown on its page (number-theory characteristics and base-10 digit properties):
- Base: +1 point for every property chip (e.g. Prime, Triangular, Palindromic).
- Bonus (rare): +3 for very special properties: Mersenne, Mersenne prime, Fermat number, Catalan number, Dudeney number, Perfect, Narcissistic.
- Bonus (medium): +2 for other notable ones: Sophie Germain prime, Safe prime, Layland, Factorial, Pandigital, Strobogrammatic, Refactorable, Powerful number, Lucas number, Gaussian prime, Kaprekar, Smith, Automorphic, Trimorphic, Hoax number, Zuckerman number.
The total is the interestingness score. Higher means more properties and/or rarer ones. On each number page you also see how many chips are in each section.
Example
Number 6 has a score of 31.
It has the following properties (each contributing base points and possibly bonus):
Triangular, Hexagonal, Evil number, Pronic, Factorial, Even, Ones-Zeroes, Palindromic, Harshad, Repdigit, Automorphic, Spy number, Narcissistic, Trimorphic, Zuckerman number, Composite, Perfect
Plus the usual classification (Prime/Unit/Composite) and, when applicable, Perfect/Abundant/Deficient and Twin Prime.
Top 1000 most interesting numbers
Precomputed list; same order as on number pages (by score, then by number). Paginated 50 per page.
| Rank | Number | Score |
|---|---|---|
| 601 | 1579 | 8 |
| 602 | 1592 | 8 |
| 603 | 1612 | 8 |
| 604 | 1627 | 8 |
| 605 | 1634 | 8 |
| 606 | 1644 | 8 |
| 607 | 1649 | 8 |
| 608 | 1650 | 8 |
| 609 | 1664 | 8 |
| 610 | 1665 | 8 |
| 611 | 1668 | 8 |
| 612 | 1688 | 8 |
| 613 | 1691 | 8 |
| 614 | 1701 | 8 |
| 615 | 1715 | 8 |
| 616 | 1736 | 8 |
| 617 | 1747 | 8 |
| 618 | 1759 | 8 |
| 619 | 1770 | 8 |
| 620 | 1776 | 8 |
| 621 | 1783 | 8 |
| 622 | 1788 | 8 |
| 623 | 1816 | 8 |
| 624 | 1831 | 8 |
| 625 | 1832 | 8 |
| 626 | 1864 | 8 |
| 627 | 1867 | 8 |
| 628 | 1876 | 8 |
| 629 | 1884 | 8 |
| 630 | 1889 | 8 |
| 631 | 1900 | 8 |
| 632 | 1912 | 8 |
| 633 | 1924 | 8 |
| 634 | 1928 | 8 |
| 635 | 1935 | 8 |
| 636 | 1952 | 8 |
| 637 | 1961 | 8 |
| 638 | 1962 | 8 |
| 639 | 1973 | 8 |
| 640 | 1979 | 8 |
| 641 | 1987 | 8 |
| 642 | 33 | 7 |
| 643 | 48 | 7 |
| 644 | 77 | 7 |
| 645 | 90 | 7 |
| 646 | 105 | 7 |
| 647 | 110 | 7 |
| 648 | 117 | 7 |
| 649 | 126 | 7 |
| 650 | 140 | 7 |