A043526 Numbers having two 9's in base 10.

99, 199, 299, 399, 499, 599, 699, 799, 899, 909, 919, 929, 939, 949, 959, 969, 979, 989, 990, 991, 992, 993, 994, 995, 996, 997, 998, 1099, 1199, 1299, 1399, 1499, 1599, 1699, 1799, 1899, 1909, 1919, 1929, 1939, 1949, 1959, 1969

Offset

1,1

Links

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

Mathematica

Select[Range[2000], DigitCount[#, 10, 9]==2&] (* Harvey P. Dale, May 08 2018 *)

Crossrefs

Subsequence of A011539.

Sequence in context: A157947 A097599 A033674 * A031500 A044431 A044812

Adjacent sequences: A043523 A043524 A043525 * A043527 A043528 A043529

Keyword

nonn,base

Author

Clark Kimberling

Status

approved