Monday, September 22, 2014

5545

5545 = 5 x 1109.

5545 is a member of the Fibonacci-type sequence starting with 1 and 5 (A022095).

5545 uses only the digits 1 and 2 in base 4 (1112221) and base 7 (22111).

5545 is a concentric dodecagonal number (A195143).

5545 has two representations as a sum of two squares: 5545 = 192 + 722 = 282 + 692.

5545 is the hypotenuse of two primitive Pythagorean triples: 55452 = 27362 + 48232 = 38642 + 39772.


Source: What's Special About This Number?

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