47

This number is a prime.

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The first-ever photograph made in a proper camera, titled "View From the Window" (created by French inventor Nicéphore Niépce between 1826-27) fell into obscurity for 47 years from 1905 to 1952, before Helmut Gernsheim and his wife, Alison Gernsheim tracked down the photograph. [Gudipati]

The smallest number n whose sum of digits in n¹, n², n³ and n⁴ are all primes. [Gudipati]