Counting

[GuyBarry]

One of the more bizarre claims I've come across in my quest for interesting number facts is that "frequent use of 741 Hz leads to a healthier, simpler life, and also to changes in diet towards foods which are not poisoned by various kinds of toxins". This comes from the so-called theory of solfeggio frequencies, which are supposedly an ancient musical scale with all sorts of mystical properties. It appears to have been invented by Leonard Horowitz and Joseph Puleo in 1999 with no supporting evidence whatsoever.

[RobbieM]

Wow. I never knew that about 741. I do know that 742 used to be the last three digits of Sheffield's STD code...

[GuyBarry]

The sun's mass is about 743 times the combined mass of all the planets in the solar system. [Source: NumberADay]

[The Orange One]

The Boeing 747-400 (the most successful commercial aircraft) has the short form Boeing 744.

(Sorry to spoil whoever was waiting for 747).

[GuyBarry]

745 is the smallest number whose square begins with three 5s: 745^2 = 555025.

[DrainBrain]

The 746 Type phone did not come with any pre-installed apps.

[Going Underground]

Saxon's website includes 747 from their most well known song.... "747 Strangers in the night"

http://www.saxon747.com/en/

[GuyBarry]

The Ducati 748 was a sport bike made from 1994 to 2002.

[RobbieM]

749 were the first three digits of our family's telephone number in Preston from 1980 to 2003.

[GuyBarry]

[...and, as it happens, the last three digits of the code for Shepton Mallet, the area in which I grew up.]

750 is the 15th nonagonal number - the number of dots in a nonagon (nine-sided polygon) with 15 dots per side.

Three-quarters of the way to the magic thousand now...

[DrainBrain]

There are 751 lattice points inside the ball defined by the equation x^2+y^2+z^2 <= 32

OEIS: A117609

[RobbieM]

752 - the last three digits of Plymouth's STD code.

[GuyBarry]

753 is the smallest number whose cube contains four consecutive 7s: 753^3 = 426957777. [Source: http://www2.stetson.edu/~efriedma/numbers.html]

[RobbieM]

For a bracing holiday, head to Skegness. To book your accommodation, dial 01, then 754. (And a few other numbers too.)

[GuyBarry]

In the Unix operating system, a file permission of 755 means read and execute access for everyone, and also write access for the owner of the file.