John D. Cook
@johndcook.bsky.social
Mathematician, data privacy consultant
See also @johndcook.mathstodon.xyz.ap.brid.gy
See also @johndcook.mathstodon.xyz.ap.brid.gy
September 24, 2025 at 3:10 PM
August 5, 2025 at 1:04 PM
March 17, 2025 at 1:28 AM
March 9, 2025 at 2:20 PM
February 13, 2025 at 12:56 PM
Does DeepSeek demonstrate that we don’t need as much compute power as we thought?
www.johndcook.com/blog/2025/02...
www.johndcook.com/blog/2025/02...
February 3, 2025 at 8:04 PM
Does DeepSeek demonstrate that we don’t need as much compute power as we thought?
www.johndcook.com/blog/2025/02...
www.johndcook.com/blog/2025/02...
New podcast interview just dropped.
Protecting Privacy in the Age of AI: A Conversation with John Cook
www.trenegy.com/podcast/prot...
Protecting Privacy in the Age of AI: A Conversation with John Cook
www.trenegy.com/podcast/prot...
Protecting Privacy in the Age of AI: A Conversation with John Cook
We discuss safeguarding sensitive information in data-intensive industries, the balance of preserving data utility and protecting privacy as AI applications raise new concerns, and methods like differ...
www.trenegy.com
January 16, 2025 at 10:07 PM
New podcast interview just dropped.
Protecting Privacy in the Age of AI: A Conversation with John Cook
www.trenegy.com/podcast/prot...
Protecting Privacy in the Age of AI: A Conversation with John Cook
www.trenegy.com/podcast/prot...
How the day of the week for New Years Day goes through a 28 year cycle.
The green diamonds represent leap years and the blue squares represent ordinary years.
The green diamonds represent leap years and the blue squares represent ordinary years.
January 1, 2025 at 3:22 AM
How the day of the week for New Years Day goes through a 28 year cycle.
The green diamonds represent leap years and the blue squares represent ordinary years.
The green diamonds represent leap years and the blue squares represent ordinary years.
December 31, 2024 at 1:08 AM
Centered triangular numbers are the number of dots in images such as the one below.
The nth centered triangular number equals 1 + 3n(n + 1)/2.
The nth centered triangular number equals 1 + 3n(n + 1)/2.
December 25, 2024 at 3:47 PM
Centered triangular numbers are the number of dots in images such as the one below.
The nth centered triangular number equals 1 + 3n(n + 1)/2.
The nth centered triangular number equals 1 + 3n(n + 1)/2.
Most popular posts of 2024
Most popular posts on this site in 2024, according to Hacker News.
www.johndcook.com
December 24, 2024 at 3:42 PM
By the nth day of Christmas, my true love had sent to me n(n+1)(n+2)/6 gifts.
www.johndcook.com/blog/2009/12...
www.johndcook.com/blog/2009/12...
Twelve Days of Christmas and tetrahedral numbers
How many gifts are there in the song Twelve Days of Christmas? Day 1: 1 gift Day 2: 1 + 2 = 3 gifts Day 3: 1 + 2 + 3 = 6 gifts … Day 12: 1 + 2 + 3 + … + 12 = 78 gifts The number of gifts on day
www.johndcook.com
December 20, 2024 at 4:59 PM
By the nth day of Christmas, my true love had sent to me n(n+1)(n+2)/6 gifts.
www.johndcook.com/blog/2009/12...
www.johndcook.com/blog/2009/12...
December 19, 2024 at 4:13 PM
If you press the cosine key on a calculator over and over, you always get stuck on the same number.
This post takes a more sophisticated look at a child’s amusement.
www.johndcook.com/blog/2024/12...
This post takes a more sophisticated look at a child’s amusement.
www.johndcook.com/blog/2024/12...
December 17, 2024 at 6:05 PM
If you press the cosine key on a calculator over and over, you always get stuck on the same number.
This post takes a more sophisticated look at a child’s amusement.
www.johndcook.com/blog/2024/12...
This post takes a more sophisticated look at a child’s amusement.
www.johndcook.com/blog/2024/12...
A golden hospital gown is an allusion to The Emperor’s New Clothes, except the emperor is somewhere between sumptuously clothed and naked.
www.johndcook.com/blog/2024/12...
www.johndcook.com/blog/2024/12...
December 16, 2024 at 1:10 PM
A golden hospital gown is an allusion to The Emperor’s New Clothes, except the emperor is somewhere between sumptuously clothed and naked.
www.johndcook.com/blog/2024/12...
www.johndcook.com/blog/2024/12...
How many ways can you select six points in the plane so that every subset of three points forms the vertices of an isosceles triangle?
www.johndcook.com/blog/2024/12...
www.johndcook.com/blog/2024/12...
December 9, 2024 at 2:17 PM
How many ways can you select six points in the plane so that every subset of three points forms the vertices of an isosceles triangle?
www.johndcook.com/blog/2024/12...
www.johndcook.com/blog/2024/12...
December 7, 2024 at 7:58 PM
December 3, 2024 at 10:58 PM
My Mastodon posts are automatically posted to the Bluesky account @johndcook.mathstodon.xyz.ap.brid.gy
November 30, 2024 at 9:10 PM
My Mastodon posts are automatically posted to the Bluesky account @johndcook.mathstodon.xyz.ap.brid.gy