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A084632
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Semiprimes such that when they are concatenated with their 10's complement, which also must be a semiprime, the result is a prime.
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0
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49, 91, 169, 237, 319, 321, 329, 377, 411, 417, 473, 529, 553, 583, 597, 629, 697, 713, 763, 779, 791, 817, 913, 923, 949, 1203, 1257, 1273, 1339, 1347, 1379, 1389, 1497, 1501, 1509, 1529, 1589, 1633, 1739, 1803, 1841, 1967, 1969, 2019, 2103, 2173, 2219
(list; graph; refs; listen; history; internal format)
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