A039425 Numbers whose base-10 representation has the same nonzero number of 4's and 7's.

47, 74, 147, 174, 247, 274, 347, 374, 407, 417, 427, 437, 457, 467, 470, 471, 472, 473, 475, 476, 478, 479, 487, 497, 547, 574, 647, 674, 704, 714, 724, 734, 740, 741, 742, 743, 745, 746, 748, 749, 754, 764, 784, 794, 847, 874, 947, 974, 1047, 1074

Offset

1,1

Links

Table of n, a(n) for n=1..50.

Crossrefs

Sequence in context: A092178 A338273 A165335 * A043248 A044028 A126095

Adjacent sequences: A039422 A039423 A039424 * A039426 A039427 A039428

Keyword

nonn,base,easy

Author

Olivier Gérard

Status

approved