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A128283
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a[n]= is the n-th smallest product of 2 odd primes m=p1*p2, such that (d+m/d)/2 are all primes for each d dividing m.
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4
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21, 33, 57, 85, 93, 133, 145, 177, 205, 213, 217, 253, 393, 445, 553, 565, 633, 697, 793, 817, 865, 913, 933, 973, 1137, 1285, 1345, 1417, 1437, 1465, 1477, 1513, 1537, 1717, 1765, 1837, 1857, 1893, 2101, 2173, 2245, 2305, 2517, 2577, 2581, 2605, 2641, 2653
(list; graph; refs; listen; history; internal format)
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