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A109559
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a(n) = If[Floor[2*Mod[(Prime[n + 1] - Prime[n])*PrimePi[n]/n, 8]] == 5, Prime[n]]
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0
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23, 31, 283, 337, 409, 421, 547, 577, 631, 661, 797, 997, 1201, 1237, 1307, 1459, 1499, 1511, 1531, 1583, 1709, 1789, 1811, 1889, 2039, 2357, 2423, 2633
(list; graph; refs; listen; history; internal format)
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