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A106550 a(n) = n-th semiprime + (concatenation of its two factors, smallest factor first). +0
5
26, 29, 42, 35, 41, 50, 58, 233, 80, 239, 344, 251, 92, 257, 352, 269, 126, 368, 566, 376, 2, 87, 293, 578, 392, 311, 788, 323, 602, 329, 416, 804, 424, 341, 614, 359, 448, 638, 377, 836, 1232, 383, 464, 472, 852, 401, 488, 413, 1256, 674, 419, 686, 437, 512, 884 (list; graph; listen)
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Last modified December 18 21:37 EST 2009. Contains 171024 sequences.


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