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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
OFFSET
1,1
LINKS
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
KEYWORD
nonn,base
STATUS
approved