A279428 Numbers k such that k^2 has an odd number of digits and the middle digit is 8.
17, 22, 28, 104, 109, 122, 126, 141, 151, 164, 167, 184, 192, 197, 202, 207, 221, 232, 268, 279, 293, 298, 303, 308, 316, 1004, 1009, 1014, 1019, 1024, 1029, 1048, 1053, 1067, 1081, 1090, 1104, 1113, 1122, 1135, 1144, 1157, 1170, 1174, 1187, 1191, 1195, 1212
Offset: 1
Examples
17^2 = 2(8)9, 164^2 = 26(8)96, 1024^2 = 104(8)576.
Links
- Lars Blomberg, Table of n, a(n) for n = 1..10000
Programs
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Mathematica
ond8Q[n_]:=Module[{n2=IntegerDigits[n^2],len},len=Length[n2];OddQ[len]&&n2[[(len+1)/2]] == 8]; Select[Range[1500],ond8Q] (* Harvey P. Dale, Sep 25 2023 *)