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 A274620 If n^2 has an even number of digits, write n after the left half of the digits of n^2 and before the right half, otherwise if n^2 has 2t+1 digits, write n after the first t digits of n^2 and before the last t+1 digits. 1
 11, 24, 39, 146, 255, 366, 479, 684, 891, 11000, 11121, 11244, 11369, 11496, 21525, 21656, 21789, 31824, 31961, 42000, 42141, 42284, 52329, 52476, 62525, 62676, 72729, 72884, 82941, 93000, 93161, 103224, 103389, 113456, 123525, 123696, 133769, 143844, 153921, 164000 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS In short, write n in the middle of n^2. Portions of this sequence are sometimes given as puzzles. REFERENCES J. A. Reeds, Personal communication to N. J. A. Sloane, Jun 04 2016 LINKS Alois P. Heinz, Table of n, a(n) for n = 1..10000 EXAMPLE 4^2 = 16 so a(4) = 1.4.6 = 146; 19^2 = 361 so a(19) = 3.19.61 = 31961. CROSSREFS Sequence in context: A157756 A061043 A098603 * A053061 A055820 A114167 Adjacent sequences:  A274617 A274618 A274619 * A274621 A274622 A274623 KEYWORD nonn,base AUTHOR N. J. A. Sloane, Jul 03 2016 STATUS approved

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Last modified March 21 01:18 EDT 2019. Contains 321356 sequences. (Running on oeis4.)