A198273: Primes not of the form p*q + p + q for any primes p and q.

The foundation of the noise is static that sounds like a lot of air is being blown out (similar to a hair-dryer). 
There is also a constant high-pitched tone in the background.

Residue counts:
2   [1, 59801]
3   [1, 36942, 22859]
4   [0, 36186, 1, 23615]
5   [1, 14563, 16032, 15492, 13714]
6   [0, 36942, 1, 1, 0, 22858]
7   [1, 9762, 10546, 10394, 9763, 10165, 9171]
8   [0, 18020, 1, 14384, 0, 18166, 0, 9231]
9   [0,A198 12303, 9110, 1, 12313, 7643, 0, 12326, 6106]
10   [0, 14563, 1, 15492, 0, 1, 0, 16031, 0, 13714]
11   [0, 5900, 6339, 6172, 5945, 6082, 5923, 5905, 5882, 5908, 5746]
12   [0, 19564, 1, 1, 0, 16622, 0, 17378, 0, 0, 0, 6236]

Density information:
A(x) at x=10,100,1000,...:
[4, 13, 102, 842, 7022, 59802]

A(x)/x at x=10,100,1000,...:
0.4,0.13,0.102,0.0842,0.07022,0.059802,

First 100 first differences:
[1, 2, 2, 6, 6, 10, 8, 6, 18, 6, 6, 24, 4, 2, 6, 28, 2, 10, 8, 6, 10, 8, 12, 4, 2, 12, 12, 
6, 4, 8, 16, 20, 4, 2, 24, 6, 4, 14, 6, 10, 2, 4, 14, 6, 6, 10, 8, 4, 8, 12, 12, 24, 4, 2, 
4, 20, 12, 10, 14, 18, 6, 10, 6, 6, 2, 6, 24, 12, 4, 2, 22, 2, 10, 8, 12, 4, 14, 18, 24, 6, 
12, 6, 4, 8, 18, 10, 14, 10, 2, 6, 24, 4, 2, 18, 6, 24, 22, 8, 40, 14]

First 99 second differences:
[1,0,4,0,4,-2,-2,12,-12,0,18,-20,-2,4,22,-26,8,-2,-2,4,-2,4,-8,-2,10,0,-6,-2,4,8,4,-16,-2,
22,-18,-2,10,-8,4,-8,2,10,-8,0,4,-2,-4,4,4,0,12,-20,-2,2,16,-8,-2,4,4,-12,4,-4,0,-4,4,18,
-12,-8,-2,20,-20,8,-2,4,-8,10,4,6,-18,6,-6,-2,4,10,-8,4,-4,-8,4,18,-20,-2,16,-12,18,-2,
-14,32,-26]

From the spectrogram, there are strong spectral lines at approximately 7344 Hz and 14692 Hz, 
corresponding to 44100/6 and 44100/3 respectively. There are also smaller peaks near 8812 Hz 
and 13225 Hz. These peaks appear roughly symmetric around 11008 Hz, which corresponds to 
44100/4 = 11025 Hz. The rest of the spectrogram is fairly dark, indicating there are a 
range of frequencies that come into play with the sound. 

--Lauren Yee