t5k.org
Registered
Page analyze update date:
2026/06/04 21:59:18
Last whois update date:
2026/03/13 12:14:53
Domain Status
Registered
Paid till
15.12.2026
Available from
14.01.2027
×
![Fullscreen website screenshot]()
t5k.org Website screenshot
SEO Score
65.07%
95
Score achieved
146
Maximum score
Main Information
Title: PrimePages: prime number research records and results
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!
Keywords: unknown
Page Encoding:
utf-8
Body and server charset are different!
Page Filesize: 21 KB
Server Information
IP: 45.55.123.225
Location: United States,US,Clifton,07014,40.8364,-74.1403,America/New_York
Http Server: apache/2.4.52 (ubuntu)
Meta Tags List
- charset: utf-8
- name: viewport content: width=device-width, initial-scale=1, shrink-to-fit=no
- equiv: x-ua-compatible content: ie=edge
- name: Author content: Chris K. Caldwell
- name: description content: 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!
- name: keywords content: prime, primes, composite, number theory, mathematics, Mersenne, largest known primes, primality, factorization, GIMPS, integer, new, big, recent
Internal Links
Whois Information
domain_name: t5k.org
update_date: 2025-12-05T00:40:07.411Z
update_time: 1764895207
creation_date: 2022-12-15T00:00:18.212Z
creation_time: 1671062418
expiration_date: 2026-12-15T00:00:18.212Z
Whois Raw Data
Domain Name: T5K.ORG
Registrar: Squarespace Domains II LLC
Domain Status: client delete prohibited
Domain Status: client transfer prohibited
Registry Expiry Date: 2026-12-15T00:00:18.212Z
Creation Date: 2022-12-15T00:00:18.212Z
Updated Date: 2025-12-05T00:40:07.411Z
Name Server: NS-CLOUD-D4.GOOGLEDOMAINS.COM
Name Server: NS-CLOUD-D1.GOOGLEDOMAINS.COM
Name Server: NS-CLOUD-D3.GOOGLEDOMAINS.COM
Name Server: NS-CLOUD-D2.GOOGLEDOMAINS.COM
REGISTRAR Contact: Squarespace Domains II LLC
>>> Last update of RDAP database: 2026-03-13T12:14:53Z
Robots.txt
User-agent: *
Disallow: /avoid_this/
Disallow: /manual/
Disallow: /en_US/
Disallow: /usage/
Disallow: /TE/
Disallow: /bin/
Disallow: /bios/newcode.php
Disallow: /bios/edit.php
Disallow: /primes/newcode.php
Disallow: /primes/submit.php
Disallow: /curios/submit.php
Disallow: /curios/page.php?rank
Disallow: *generic_edit.php
Disallow: /primes/search.php
Disallow: /primes/generic_edit.php
Disallow: /bios/top20.php?type
Disallow: /bios/top20.php\?type
Crawl-delay: 30
User-agent: LinkChecker
Disallow:
## Due to a bug in linklint, must first specify a disallow in order for
## for all other directories to be allowed. Feel free to add other
## disallows below the first disallow line.
User-agent: LinkLint
Disallow: /workaroundForLinkLintRandomDirForConfig
Allow: *
SEO Audit
Technical SEO
✓
Response Code
200
Status 200 OK - page loads correctly.
!
Character Encoding
Page: utf-8, Header:
Character encoding mismatch between HTML and HTTP headers.
✓
Page Size
21860 bytes
Page size acceptable for fast loading.
✓
Resources
11 total
Optimal number of resources.
✓
Hreflang Tags
0 hreflang tags
Add hreflang tags if you have multilingual content.
✓
Robots.txt
Exists
Robots.txt file found.
!
Sitemap
Not found
Add sitemap.xml and reference it in robots.txt.
✓
HTTPS
Yes
Secure HTTPS connection enabled.
✓
Compression
gzip
Gzip or Zstd compression enabled for faster loading.
!
Caching
Not set
Add cache-control headers to improve loading speed for returning visitors.
✓
Page Speed
1.00 ms
Excellent loading speed.
On-Page SEO
✓
Title
PrimePages: prime number research records and results
Good title length (30-60 characters).
!
Meta 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! Lenght:302
Meta description too long. Reduce to 100-160 characters.
✓
H1 Heading
1 found - "The
PrimePages: prime number research &
records"
Good - single H1 heading found.
!
Word Count
322
Content somewhat short. Expand to 500+ words for optimal SEO.
!
Canonical Tag
Add canonical tag to prevent duplicate content issues.
✓
Duplicate Meta
[]
No duplicate meta tags found.
✓
Keywords
Meta keywords are optional (not used by major search engines).
Content and UX
✓
Language
en
Language attribute properly set.
✓
Images
3 total, 0 missing ALT
All images have proper ALT text.
✓
Viewport
width=device-width, initial-scale=1, shrink-to-fit=no
Viewport meta tag properly set for mobile devices.
!
Open Graph
Missing: og:title, og:description, og:image, og:url
Add missing OpenGraph tags for social media sharing: og:title, og:description, og:image, og:url
!
Structured Data
0 JSON-LD scripts
Add structured data (JSON-LD) for rich snippets and better SEO.
Positions in Google
Search Phrases - Google
| Position | Phrase | Page | Snippet |
|---|---|---|---|
| 3 | / |