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A043518 Numbers having two 7's in base 10. 3
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 (list; graph; refs; listen; history; text; internal format)
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

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Last modified October 5 15:40 EDT 2022. Contains 357259 sequences. (Running on oeis4.)