Monday, April 1, 2013


1473 = 3 x 491.

1473 is an odd number whose sum of prime factors is palindromic (A046353): 3 + 491 = 494.

1473 is a semiprime (A001358) that is the sum of a semiprime k and the kth semiprime (A100467).

1473 is the number of lattice points inside the right triangle with legs 16 x 3 and 16 x 4 (and hypotenuse 16 x 5) (A126587).

1473 is the sum of the digit reversals of the first 41 natural numbers (A062918).

1473 is the smallest number that can be expressed as the sum of distinct Lucas numbers (A000204) in exactly 27 ways (A055635).

The leftmost digit of 1473 gives the number of even digits in 1473 and the rightmost digit of 1473 gives the number of odd digits in the number (A107837).

Mathematician and astronomer Nicolaus Copernicus was born in the year 1473.

Source: On-Line Encyclopedia of Integer Sequences

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