Contenting Logo

News

Breaking News

Entertainment

Movies & Series
Music
Cheezy
Gaming
Geek

Science & Technology

Science
Technology
Software
Innovation
Nature & Animals

Sport

Football (Soccer)
Basketball
Motor Sport
E-Sport
Other Sports

Business & Money

Economy
Startups
Cryptocurrency
Career
Marketing
Education & Personal Development

Life

Lifestyle
Wellness
Travel
Health
Kids & Parenting
Women's Lifestyle
Fashion & Style
Beauty & Care
Men's Lifestyle

Culture & Art

Books & Literature
History
Photography
Art

Hobbies

Food
Automotive
Social Media
Sites
Lists
#tags

News

Breaking News

Entertainment

Movies & Series
Music
Cheezy
Gaming
Geek

Science & Technology

Science
Technology
Software
Innovation
Nature & Animals

Sport

Football (Soccer)
Basketball
Motor Sport
E-Sport
Other Sports

Business & Money

Economy
Startups
Cryptocurrency
Career
Marketing
Education & Personal Development

Life

Lifestyle
Wellness
Travel
Health
Kids & Parenting
Women's Lifestyle
Fashion & Style
Beauty & Care
Men's Lifestyle

Culture & Art

Books & Literature
History
Photography
Art

Hobbies

Food
Automotive
Social Media
Sites
Lists
#tags
  1. home
  2. ›
  3. John D. Cook Consulting Blog

John D. Cook Consulting Blog

9 | Follower

Science

See All

John D. Cook Consulting Blog

27.06.2025

Legendre PRF and Ethereum 2.0 Proof of Custody

The Legendre symbol is notation for whether a quadratic equation has a solution modulo a prime. What does this have to do with Ethereum proof of custody?

John D. Cook Consulting Blog

27.06.2025

Test whether an arbitrarily large integer is a square

A short and sweet bit of Python code to test whether an arbitrarily large integer is a square, and to find the floor of the square root.

John D. Cook Consulting Blog

28.06.2025

Most machine integers are not machine floats

Most numbers that are representable as machine integers are not exactly representable as floating point numbers.

John D. Cook Consulting Blog

29.06.2025

Zooming in on a fractalish plot

The exponential sum of the day page on my site draws an image every day by plugging the month, day, and year into a formula. Details here. Today's image looks almost solid blue in the middle. The default plotting line width works well for most days. For example, see what the sum of the day

Contenting Logo
About UsPrivacy PolicyTerms Of UseContact