A043518 Numbers having two 7's in base 10.

77, 177, 277, 377, 477, 577, 677, 707, 717, 727, 737, 747, 757, 767, 770, 771, 772, 773, 774, 775, 776, 778, 779, 787, 797, 877, 977, 1077, 1177, 1277, 1377, 1477, 1577, 1677, 1707, 1717, 1727, 1737, 1747, 1757, 1767, 1770, 1771

Offset

1,1

Links

Daniel Starodubtsev, Table of n, a(n) for n = 1..10000

Mathematica

Select[Range[2000], DigitCount[#, 10, 7]==2&] (* Harvey P. Dale, Jul 30 2022 *)

Crossrefs

Subsequence of A011537.

Sequence in context: A217790 A046513 A199994 * A044409 A044790 A255095

Adjacent sequences: A043515 A043516 A043517 * A043519 A043520 A043521

Keyword

nonn,base

Author

Clark Kimberling

Status

approved