Showing posts with label centered octahedral number. Show all posts
Showing posts with label centered octahedral number. Show all posts

Friday, February 28, 2014

7175

7175 = 5 x 5 x 7 x 41.

7175 is 1110000000111 in base 2 (binary) (A222813). It is 1300013 in base 4.

7175 is a centered octahedral number (A001845). It is also a tetradecagonal number (A051866).

7175 divides 6410 - 1.


Source: What's Special About This Number?

Monday, September 24, 2012

575

575 = 5 x 5 x 23.

575 is a palindrome that is 1 less than a square (576 = 242).

575 is 353 in base 13 (A029968).

575 is a centered octahedral number (A001845).

575 is the number of quadrilaterals that can be formed with perimeter 53 (in other words, partitions of 53 into four parts such that the sum of any three is more than the fourth) (A062890).


Source: What's Special About This Number?