A007693 Primes p such that 6*p + 1 is also prime. Residue counts: 2 [1, 14435] 3 [1, 7245, 7190] 4 [0, 7276, 1, 7159] 5 [1, 4774, 4798, 4863, 0] 6 [0, 7245, 1, 1, 0, 7189] 7 [1, 0, 2865, 2917, 2920, 2830, 2903] 8 [0, 3620, 1, 3588, 0, 3656, 0, 3571] 9 [0, 2432, 2371, 1, 2407, 2391, 0, 2406, 2428] 10 [0, 4774, 1, 4863, 0, 1, 0, 4797, 0, 0] 11 [1, 1576, 1582, 1612, 1612, 1593, 1601, 1609, 1640, 0, 1610] 12 [0, 3658, 1, 1, 0, 3618, 0, 3587, 0, 0, 0, 3571] Noisy like other sequences of primes. Not as much of as much of a high frequency screech as other prime sequences. First notable spectrogram band around 1470 (44100/30). -- Joeph Rafael