OFFSET
1,2
LINKS
Daniel Starodubtsev, Table of n, a(n) for n = 1..10000
MATHEMATICA
Select[Range[150], DigitCount[#, 7, 0]==DigitCount[#, 7, 2]&] (* Harvey P. Dale, Sep 22 2019 *)
CROSSREFS
KEYWORD
nonn,base,easy
AUTHOR
STATUS
approved