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A109558
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a(n) = If[Floor[2*Mod[(Prime[n + 1] - Prime[n])*PrimePi[n]/n, 8]] == 4, Prime[n]]
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0
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7, 13, 19, 47, 53, 61, 73, 83, 131, 359, 389, 401, 449, 479, 491, 691, 709, 787, 811, 829, 919, 1021, 1039, 1051, 1153, 1171, 1249, 1399, 1471, 1627, 1699, 1723, 1801, 1879, 2017, 2029, 2053, 2069, 2089, 2099, 2143, 2297, 2399, 2447, 2579, 2621
(list; graph; refs; listen; history; internal format)
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