Thursday, October 31, 2013

9090

9090 = 2 x 3 x 3 x 5 x 101.

9090 has two representations as a sum of two squares: 9090 = 212 + 932 = 392 + 872.

9090 is a divisor of 914 - 1.

9090 is the number of centered 6-valent trees with 16 nodes (A036651).


Source: On-Line Encyclopedia of Integer Sequences

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