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A039429
Numbers whose base-10 representation has the same nonzero number of 5's and 7's.
0
57, 75, 157, 175, 257, 275, 357, 375, 457, 475, 507, 517, 527, 537, 547, 567, 570, 571, 572, 573, 574, 576, 578, 579, 587, 597, 657, 675, 705, 715, 725, 735, 745, 750, 751, 752, 753, 754, 756, 758, 759, 765, 785, 795, 857, 875, 957, 975, 1057, 1075
OFFSET
1,1
MATHEMATICA
Select[Range[1200], DigitCount[#, 10, 5]==DigitCount[#, 10, 7]>0&] (* Harvey P. Dale, Jan 14 2014 *)
CROSSREFS
Sequence in context: A072054 A336330 A230956 * A043252 A044032 A104760
KEYWORD
nonn,base,easy
STATUS
approved