Interesting. The 47s reference may come from the episode of Voyager where they find Amelia Earhart along with some other people who were abducted in 1947 enshrined and reffered to as "the 47s"
No, that was "The '37s." However, there are numerous references to 47s in Trek lore before Voyager, tied by the writers at Memory Alpha to a writer for TNG (and later, Voyager). Rick Berman was said to have joked that it was 42 corrected for inflation.