Tags » Primes

Sigma Announces New ART Series Lenses

No… These aren’t cinema lenses. They’re auto-focus, still photography lenses. Sigma has just announced three new lenses in their ART line of still-photo lenses: 14mm f/1.8, 135mm f/1.8, and a 24-70mm f/2.8. 480 more words

News

Industrial Strength Left-truncated Prime Checker

I saw a post on Facebook about left-truncatable prime numbers.  A left-truncatable prime number is a prime number that is still prime with each successive removal of its left-most digit.   1,016 more words

The Next Leader Of Cybertron Is A Total Beast

(Source: kotaku.com)

Earlier this month a Transformer near and dear to my heart faced off against Ultra Magnus, Star Saber and Deathsaurus in a fan vote for who would be the next ‘bot to wield the Matrix of Leadership. 210 more words

Technology

Sharing John Cook's Fibonacci / Prime post with kids

Saw a neat post from John Cook about using a fun fact about the Fibonacci numbers to prove there are an infinite number of primes: 304 more words

Sums of Squares and Density

Lagrange’s Four Square Theorem (Lagrange, 1770) is the well-known result that every positive integer can be written as the sum of four integer squares. This was strengthened by Legendre’s 1797-1798 proof of the similar-sounding… 1,275 more words

Probability

Sieve of Eratosthenes (without iteration) in MATLAB

For my CS class there was an extra credit problem in this week’s problem set where we had to write a sieve of Eratosthenes to find prime numbers up to an input integer. 525 more words