A124024: Numbers k such that 20*k + 1 is prime

Noisy, moderately screechy.

Residue counts:
2   [79269, 79442]
3   [79315, 0, 79396]
4   [39630, 39709, 39639, 39733]
5   [31722, 31695, 31702, 31807, 31785]
6   [39619, 0, 39650, 39696, 0, 39746]
7   [26378, 0, 26506, 26455, 26365, 26572, 26435]
8   [19814, 19868, 19828, 19832, 19816, 19841, 19811, 19901]
9   [26500, 0, 26419, 26454, 0, 26507, 26361, 0, 26470]
10   [15799, 15834, 15866, 15908, 15844, 15923, 15861, 15836, 15899, 15941]
11   [15859, 15883, 15805, 15870, 15855, 15855, 0, 15878, 15950, 15879, 15877]
12   [19773, 0, 19793, 19837, 0, 19850, 19846, 0, 19857, 19859, 0, 19896]

Very dark band only at 14700Hz (44100/3). This is because most the non-uniform moduli are 3
and the moduli which are multiples of 3. Other classes have nearly uniform distributions.

--Joeph Rafael