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A039409
Numbers whose base-10 representation has the same nonzero number of 1's and 9's.
0
19, 91, 109, 129, 139, 149, 159, 169, 179, 189, 190, 192, 193, 194, 195, 196, 197, 198, 219, 291, 319, 391, 419, 491, 519, 591, 619, 691, 719, 791, 819, 891, 901, 910, 912, 913, 914, 915, 916, 917, 918, 921, 931, 941, 951, 961, 971, 981, 1009, 1029
OFFSET
1,1
MATHEMATICA
Select[Range[1100], DigitCount[#, 10, 1]==DigitCount[#, 10, 9]>0&] (* Harvey P. Dale, Jan 08 2015 *)
CROSSREFS
Sequence in context: A377729 A302710 A157875 * A038653 A043232 A044012
KEYWORD
nonn,base,easy
STATUS
approved