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A063781
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Numbers k such that there exist sequences a_i, b_i in N (i=1,2,3,4) with 0 < a_1 < a_2 < a_3 < a_4 < k, 0 < b_1 < b_2 < b_3 < b_4 < k and a_i != b_j for all i,j = 1,2,3,4, satisfying both Sum_{i=1..4} a_i = Sum_{i=1..4} b_i = 2*k and Product_{i=1..4} sin(a_i * Pi/(2*k)) = Product_{i=1..4} sin(b_i * Pi/(2*k)).
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2
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15, 18, 20, 24, 25, 30, 33, 35, 36, 40, 42, 45, 48, 50, 54, 55, 57, 60, 63, 65, 66, 70, 72, 75, 78, 80, 84, 85, 90, 95, 96, 99, 100, 102, 105, 106, 108, 109, 110, 114, 115, 118, 120, 125, 126, 128, 129, 130, 132, 133, 134, 135, 137, 138, 139, 140, 141, 142, 143
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