Thursday, December 5, 2013

5415

5415 = 3 x 5 x 19 x 19.

5415 is a number n such that n and its reversal (5145) are both multiples of 15 (A062905).

5415 is a number n such that the sum of the digits of n equals the squarefree part of n (A070274).

5415 is the smallest number n such that 2n + 1, 4n + 1, 6n + 1, 8n + 1, and 10n + 1 are all prime numbers (A124410).

5415 is a number that cannot be written as a sum of three squares.

5415 is a divisor of 6812 - 1.


Source: On-Line Encyclopedia of Integer Sequences

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