Wednesday, February 18, 2009

75

75 = 3 x 52

75 is the smallest pandigital number in base 4: 75 is written as 1023 in base 4 and contains all the possible digits.

75 is 55 in base 14.

275 + 75 is a prime number.

Take the "digit sum" 7 + 5 = 12, then continue adding in pairs (as shown below). You reach 75.
7 + 5 = 12
5 + 12 = 17
12 + 17 = 29
17 + 29 = 46
29 + 46 = 75


Messier object M75 is a globular cluster in the constellation Sagittarius.

Source: Number Gossip

1 comment:

Gary said...

Please reformat the text so the digit sums and pairs are actually reasonably legible. I had absolutely no idea what was being done until I had read through it a few times.