The Number 1705

Prime Factors of 1705=5x11x31.

1705 is the smallest quasi-Carmichael number in base 4.

The Year 1705 AD

In the year 1705 AD Edmond Halley predicted, using Newton's newly formulated laws of motion, that the comet seen in 1531, 1607, and 1682 would return in 1758 (which was, alas, after his death). The comet did indeed return as predicted and was later named in his honor.

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