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A108970
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Concatenation of triangular number k and its 10's complement is prime.
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0
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1, 3, 21, 91, 561, 861, 903, 1953, 3003, 3741, 5151, 13203, 16653, 17391, 22791, 25651, 29161, 29403, 44253, 45753, 56953, 57291, 64261, 87153, 88831, 97903, 102831, 118341, 128271, 157641, 178503, 179101, 203841, 208981, 216811, 229503
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