numbers.education
Prime numbers: mathematical properties, how to find whether a number is prime?
Last scanned Aug 24, 2026, 1:22 PM
Overall score
Great
Summary
What are the prime numbers? How to determine whether a number is a prime number?. This website uses PHP hosted on OVH - OVH SAS, FR. SEO is good (80/100) and accessibility is excellent (100/100). Security scores fair (70/100) and performance good (85/100). Top issue: Title longer than 60 characters.
What are the prime numbers? How to determine whether a number is a prime number?
- France
- Hosted on OVH - OVH SAS, FR
Top issues to fix
7 issues found · 2 high priority
Missing Strict-Transport-Security header
SecurityAdd HSTS so browsers always use HTTPS — this closes the protocol-downgrade attack window.
Missing Content-Security-Policy header
SecurityAdd a CSP to control which sources can run scripts — the strongest single defense against XSS.
TLS certificate expires in 23 days
SecurityRenew soon or enable auto-renewal to avoid a browser-warning outage.
Missing X-Frame-Options header
SecurityAdd X-Frame-Options (or a CSP frame-ancestors rule) to prevent clickjacking via hidden iframes.
Title longer than 60 characters
SEOShorten the title to under 60 characters so search results don't truncate it.
No structured data (JSON-LD) found
SEOAdd JSON-LD (Organization, Article, Product…) to become eligible for rich results.
+1 more issue — details in the sections below.
SEO
3 issue(s) found
Performance
237 ms
Security
HTTPS & header checks
Accessibility
0 issue(s) found
Organization
Company details published in this site's own structured data.
What are the prime numbers? How to determine whether a number is a prime number?
Contact
Email, phone, and address published on this site's own pages.
Meta tags
- Title
- Prime numbers: mathematical properties, how to find whether a number is prime?
- Description
- What are the prime numbers? How to determine whether a number is a prime number?
- Canonical
- https://www.numbers.education/
- Language
- en
- Charset
- utf-8
- Viewport
- width=device-width, initial-scale=1
- Robots meta
- index, follow
- Manifest
Technologies
Detected frameworks, languages, and tools.
Hosting & CDN
- Hosting provider
- OVH - OVH SAS, FR
- CDN provider
- —
- IP address
- 213.186.33.19
- ASN
- AS16276 (OVH - OVH SAS, FR)
DNS records
| Type | Value |
|---|---|
| A |
|
| AAAA |
|
| MX |
|
| TXT |
|
| NS | — |
| CAA | — |
| CNAME | — |
| IPv6 support | Yes |
TLS / SSL certificate
- Version
- TLS 1.3
- Issuer
- Let's Encrypt
- Subject
- www.numbers.education
- Valid from
- Jun 19, 2026
- Valid to
- Sep 17, 2026
- Days until expiry
- 23
- SAN domains
- www.numbers.education
Security headers
- Strict-Transport-SecurityMissing
- Content-Security-PolicyMissing
- X-Frame-OptionsMissing
- X-Content-Type-OptionsEnabled
- Referrer-PolicyEnabled
- Permissions-PolicyMissing
Compression: gzip · 0 cookie(s) observed
Content & assets
Headings
H1 1 · H2 11 · H3 0
Links
55 internal · 23 external · 0 broken
Images
0 total · 0 missing alt
Scripts / Styles
24 scripts · 4 stylesheets
JS / CSS size
1.2 MB · 60.8 KB
Page size
17.2 KB
Robots.txt & Sitemap
- robots.txt
- Found
- Disallow rules
- 1
- sitemap.xml
- Found
- URLs in sitemap
- -1
SEO issues
- Title longer than 60 characters
- No structured data (JSON-LD) found
- Missing OpenGraph tags
Accessibility issues
No accessibility issues detected.
Scan details
- Requested URL
- https://numbers.education
- Final URL
- https://www.numbers.education/
- HTTP status
- 200
- HTTP version
- HTTP/2
- Response time
- 237 ms
- HTML size
- 17.2 KB
- Redirect chain
- https://numbers.education → https://www.numbers.education/
See something wrong on this report? Request a correction
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Frequently asked questions
- What technology does numbers.education use?
- numbers.education is built with PHP, jQuery, Google Ads, Apache.
- Is numbers.education secure (HTTPS)?
- Yes. numbers.education uses TLS 1.3 with a certificate issued by Let's Encrypt, valid until Sep 17, 2026.
- Who hosts numbers.education?
- numbers.education is hosted on OVH - OVH SAS, FR.
- What is numbers.education's SEO score?
- numbers.education scored 80/100 for SEO in the latest analysis (great).
- What is numbers.education's overall website score?
- numbers.education has an overall SiteGraph score of 83/100, combining SEO, performance, security, and accessibility.
OpenGraph & Twitter Card
OpenGraph
Twitter Card