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A046424
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4 steps needed to reach a prime under prime factor concatenation procedure.
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0
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10, 15, 16, 26, 27, 95, 118, 119, 121, 132, 145, 202, 204, 217, 286, 295, 302, 308, 354, 361, 370, 377, 400, 437, 451, 453, 455, 471, 474, 483, 506, 518, 526, 528, 530, 545, 567, 600, 610, 616, 635, 649, 650, 654, 655, 672, 699, 700, 718, 720, 722, 735, 745
(list; graph; refs; listen; history; internal format)
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