A039170 - OEIS

A039170

Numbers whose base-11 representation has the same number of 1's and 7's.

0, 2, 3, 4, 5, 6, 8, 9, 10, 18, 22, 24, 25, 26, 27, 28, 30, 31, 32, 33, 35, 36, 37, 38, 39, 41, 42, 43, 44, 46, 47, 48, 49, 50, 52, 53, 54, 55, 57, 58, 59, 60, 61, 63, 64, 65, 66, 68, 69, 70, 71, 72, 74, 75, 76, 78, 88, 90, 91, 92, 93, 94, 96, 97, 98, 99, 101, 102, 103

(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, 500], DigitCount[#, 11, 1] == DigitCount[#, 11, 7] &] (* G. C. Greubel, Nov 01 2017 *)

PROG

(PARI) isok(n) = my(d=digits(n, 11)); #select(x->(x==1), d) == #select(x->(x==7), d); \\ Michel Marcus, Nov 01 2017

CROSSREFS

Sequence in context: A324689 A280578 A303878 * A097624 A000398 A039267

Adjacent sequences: A039167 A039168 A039169 * A039171 A039172 A039173

KEYWORD

nonn,base,easy

AUTHOR

Olivier Gérard

STATUS

approved