Tuesday, June 4, 2013

817

817 = 19 x 43.

817 is a centered hexagonal (hex) number (A003215).

817 is the sum of three consecutive prime numbers: 817 = 269 + 271 + 277.

817 has the representation 817 = 36 + 88.

The sum of the even digits of 817 equals the sum of the odd digits of 817 (A036301).

817 is a number n such that 1 + n2 + n4 + n6 + n7 is a prime (A126908).


Source: On-Line Encyclopedia of Integer Sequences

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