OFFSET
1,1
COMMENTS
The sequence of cubes starts: 343, 1124864, 1404928, 2744000, 2924207, 3944312, 4574296, 6434856, ...
LINKS
Lars Blomberg, Table of n, a(n) for n = 1..10000
Jeremy Gardiner, Middle digit in cube numbers, Seqfan Mailing list, Dec 12 2016.
EXAMPLE
7^3 = 3(4)3, 195^3 = 741(4)875, 640^3 = 2621(4)4000
MATHEMATICA
Select[Range[1000], OddQ[IntegerLength[#^3]]&&NumberDigit[#^3, (IntegerLength[ #^3]-1)/2]==4&] (* Harvey P. Dale, Aug 12 2021 *)
CROSSREFS
KEYWORD
nonn,base,easy
AUTHOR
Lars Blomberg, Jan 07 2017
STATUS
approved