Website review t5k.org
PrimePages: prime number research records and results
Generated on March 09 2026 18:03 PM
Old data? UPDATE !
The score is 65/100
SEO Content
Title
PrimePages: prime number research records and results
Length : 53
Perfect, your title contains between 10 and 70 characters.
Description
Access to hundreds of pages of award-winning information on prime numbers--with links to thousands of pages elsewhere. We host the searchable database of the 5000 largest known primes (updated hourly). We also have a glossary, top 10 records lists, prime-music, programs, free downloads, and much more!
Length : 302
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Keywords
prime, primes, composite, number theory, mathematics, Mersenne, largest known primes, primality, factorization, GIMPS, integer, new, big, recent
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Og Meta Properties
This page does not take advantage of Og Properties. This tags allows social crawler's better structurize your page. Use this free og properties generator to create them.
Headings
| H1 | H2 | H3 | H4 | H5 | H6 |
| 1 | 0 | 3 | 0 | 10 | 0 |
- [H1] The PrimePages: prime number research & records
- [H3] Finding/proving
- [H3] Questions?
- [H3] Prime Glossary
- [H5] What are the PrimePages?
- [H5] Largest Known Primes Database
- [H5] Other Lists of Primes Here
- [H5] Largest Known Prime by Year ↓
- [H5] How many primes are there? ↓
- [H5] The Riemann Hypothesis ↓
- [H5] Check a Number's Primality↓
- [H5] Collections
- [H5] Prime Lists
- [H5] Pages
Images
We found 3 images on this web page.
Good, most or all of your images have alt attributes.
Text/HTML Ratio
Ratio : 25%
Ideal! This page's ratio of text to HTML code is between 25 and 70 percent.
Flash
Perfect, no Flash content has been detected on this page.
Iframe
Great, there are no Iframes detected on this page.
SEO Links
URL Rewrite
Good. Your links looks friendly!
Underscores in the URLs
We have detected underscores in your URLs. You should rather use hyphens to optimize your SEO.
In-page links
We found a total of 37 links including 1 link(s) to files
| Anchor | Type | Juice |
|---|---|---|
| PrimePages | Internal | Passing Juice |
| 5000 Largest | Internal | Passing Juice |
| Top 20 Primes | Internal | Passing Juice |
| Prover Bios | Internal | Passing Juice |
| Search Primes | Internal | Passing Juice |
| FAQ | Internal | Passing Juice |
| Curios! | Internal | Passing Juice |
| Glossary | Internal | Passing Juice |
| List Summary | Internal | Passing Juice |
| PRINT LISTS | Internal | Passing Juice |
| VERIFICATION STATUS | Internal | Passing Juice |
| Minimum Sizes | Internal | Passing Juice |
| 1,000 primes | Internal | Passing Juice |
| 50,000,000 primes. | Internal | Passing Juice |
| top 20 records | Internal | Passing Juice |
| twin primes | Internal | Passing Juice |
| Mersenne primes | Internal | Passing Juice |
| up to 300 digits | Internal | Passing Juice |
| special forms | Internal | Passing Juice |
| many more | Internal | Passing Juice |
| various database searches | Internal | Passing Juice |
| Proving | Internal | Passing Juice |
| FAQ | Internal | Passing Juice |
| Prime Glossary | Internal | Passing Juice |
| The Largest Known Prime by Year | Internal | Passing Juice |
| How Big of an Infinity? | Internal | Passing Juice |
| A short note | Internal | Passing Juice |
| Check Primality | Internal | Passing Juice |
| Visit the Prime Curios! | Internal | Passing Juice |
| Proving Primality | Internal | Passing Juice |
| Proofs | Internal | Passing Juice |
| Mersenne Primes | Internal | Passing Juice |
| Donate | Internal | Passing Juice |
| Top 20 Provers | Internal | Passing Juice |
| Contact Us | Internal | Passing Juice |
| PrimePages | Internal | Passing Juice |
| Privacy notice | Internal | Passing Juice |
SEO Keywords
Keywords Cloud
known first prime lists glossary primes number largest records list
Keywords Consistency
| Keyword | Content | Title | Keywords | Description | Headings |
|---|---|---|---|---|---|
| primes | 17 |  |
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| prime | 14 | |
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| lists | 6 | |
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| first | 5 | |
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| largest | 4 | |
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Usability
Url
Domain : t5k.org
Length : 7
Favicon
Great, your website has a favicon.
Printability
Great. We have found a Print-Friendly CSS.
Language
Good. Your declared language is en.
Dublin Core
This page does not take advantage of Dublin Core.
Document
Doctype
HTML 5
Encoding
Perfect. Your declared charset is UTF-8.
W3C Validity
Errors : 0
Warnings : 0
Email Privacy
Great no email address has been found in plain text!
Deprecated HTML
Great! We haven't found deprecated HTML tags in your HTML.
Speed Tips
|
Excellent, your website doesn't use nested tables. |
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Too bad, your website is using inline styles. |
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Great, your website has few CSS files. |
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Perfect, your website has few JavaScript files. |
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Perfect, your website takes advantage of gzip. |
Mobile
Mobile Optimization
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Apple Icon |
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Meta Viewport Tag |
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Flash content |
Optimization
XML Sitemap
Missing
Your website does not have an XML sitemap - this can be problematic.
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Robots.txt
https://t5k.org/robots.txt
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Analytics
Missing
We didn't detect an analytics tool installed on this website.
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PageSpeed Insights
Device
Categories
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