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A039420 Numbers n such that representation in base 10 has same nonzero number of 3's and 7's. +0
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37, 73, 137, 173, 237, 273, 307, 317, 327, 347, 357, 367, 370, 371, 372, 374, 375, 376, 378, 379, 387, 397, 437, 473, 537, 573, 637, 673, 703, 713, 723, 730, 731, 732, 734, 735, 736, 738, 739, 743, 753, 763, 783, 793, 837, 873, 937, 973, 1037, 1073 (list; graph; listen)
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Last modified December 20 16:54 EST 2009. Contains 171081 sequences.


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