A039172 - OEIS

A039172

Numbers whose base-11 representation has the same number of 1's and 9's.

0, 2, 3, 4, 5, 6, 7, 8, 10, 20, 22, 24, 25, 26, 27, 28, 29, 30, 32, 33, 35, 36, 37, 38, 39, 40, 41, 43, 44, 46, 47, 48, 49, 50, 51, 52, 54, 55, 57, 58, 59, 60, 61, 62, 63, 65, 66, 68, 69, 70, 71, 72, 73, 74, 76, 77, 79, 80, 81, 82, 83, 84, 85, 87, 88, 90, 91, 92, 93, 94

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,2

LINKS

G. C. Greubel, Table of n, a(n) for n = 1..5000

MATHEMATICA

Select[Range[0, 100], DigitCount[#, 11, 1]==DigitCount[#, 11, 9]&] (* Harvey P. Dale, Feb 22 2017 *)

PROG

(PARI) isok(n) = my(d=digits(n, 11)); #select(x->(x==1), d) == #select(x->(x==9), d); \\ Michel Marcus, Nov 01 2017

CROSSREFS

Sequence in context: A033073 A369406 A306111 * A044958 A297145 A044820

Adjacent sequences: A039169 A039170 A039171 * A039173 A039174 A039175

KEYWORD

nonn,base,easy

AUTHOR

Olivier Gérard

STATUS

approved