In interesting plot point in the novel/movie Contact (early, so not much of a spoiler):
> […] This puts her at odds with much of the scientific community, including Drumlin, who pushes to defund SETI. Eventually, the project detects a signal from Vega, 26 light-years away, transmitting prime numbers.[a][b] Further analysis reveals a retransmission of Adolf Hitler's 1936 Olympic speech, the first TV signal to escape Earth's ionosphere.[1]
> […] This puts her at odds with much of the scientific community, including Drumlin, who pushes to defund SETI. Eventually, the project detects a signal from Vega, 26 light-years away, transmitting prime numbers.[a][b] Further analysis reveals a retransmission of Adolf Hitler's 1936 Olympic speech, the first TV signal to escape Earth's ionosphere.[1]
* https://en.wikipedia.org/wiki/Contact_(novel)