OFFSET
1,1
COMMENTS
The sequence of cubes starts: 125, 729, 1092727, 1442897, 2352637, 3112136, 3442951, 3652264, ...
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
5^3 = 1(2)5, 180^3 = 583(2)000, 618^3 = 2360(2)9032.
MATHEMATICA
a[n_]:=Part[IntegerDigits[n], (Length[IntegerDigits[n]]+1)/2];
Select[Range[0, 874], OddQ[Length[IntegerDigits[#^3]]] && a[#^3]==2 &] (* Indranil Ghosh, Mar 06 2017 *)
PROG
(PARI)
isok(k) = my(d=digits(k^3)); (#d%2 == 1) && (d[#d\2 +1] == 2);
for(k=0, 874, if(isok(k)==1, print1(k, ", "))); \\ Indranil Ghosh, Mar 06 2017
(Python)
i=0
j=1
while i<=874:
n=str(i**3)
l=len(n)
if l%2 and n[(l-1)//2]=="2":
print(str(i), end=', ')
j+=1
i+=1 # Indranil Ghosh, Mar 06 2017
CROSSREFS
KEYWORD
nonn,base,easy
AUTHOR
Lars Blomberg, Jan 07 2017
STATUS
approved