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 A279429 Numbers k such that k^2 has an odd number of digits and the middle digit is 9. 24
 3, 14, 114, 118, 130, 134, 148, 158, 161, 170, 173, 176, 187, 212, 219, 228, 230, 270, 272, 281, 288, 313, 1034, 1039, 1044, 1058, 1063, 1072, 1077, 1086, 1095, 1109, 1118, 1131, 1140, 1153, 1166, 1183, 1204, 1208, 1292, 1296, 1315, 1319, 1334, 1345, 1349 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Lars Blomberg, Table of n, a(n) for n = 1..10000 EXAMPLE 3^2 = (9), 170^2 = 28(9)00, 1086^2 = 117(9)396. MATHEMATICA Select[Range[1349], OddQ[len=Length[IntegerDigits[#^2]]]&&Part[IntegerDigits[#^2], (len+1)/2]==9 &] (* Stefano Spezia, Oct 03 2023 *) CROSSREFS Cf. A279420-A279428. Sequence in context: A276751 A085244 A265001 * A333797 A229113 A180435 Adjacent sequences: A279426 A279427 A279428 * A279430 A279431 A279432 KEYWORD nonn,base,easy,changed AUTHOR Lars Blomberg, Dec 22 2016 STATUS approved

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Last modified October 3 19:07 EDT 2023. Contains 365870 sequences. (Running on oeis4.)