OFFSET
1,1
LINKS
Lars Blomberg, Table of n, a(n) for n = 1..10000
EXAMPLE
13^2 = 1(6)9, 133^2 = 17(6)89, 284^2 = 80(6)56.
MATHEMATICA
Select[Range[1200], OddQ[IntegerLength[#^2]]&&IntegerDigits[#^2][[(IntegerLength[ #^2]+1)/2]] == 6&] (* Harvey P. Dale, May 28 2023 *)
CROSSREFS
KEYWORD
nonn,base,easy
AUTHOR
Lars Blomberg, Dec 22 2016
STATUS
approved