OFFSET
1,1
LINKS
Harvey P. Dale, Table of n, a(n) for n = 1..1000
MATHEMATICA
Select[Range[1100], DigitCount[#, 10, 7]==DigitCount[#, 10, 9]>0&] (* Harvey P. Dale, Aug 30 2020 *)
CROSSREFS
KEYWORD
nonn,base,easy
AUTHOR
STATUS
approved