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 A253445 a(n) = concatenation of n^2 with itself. 2
 11, 44, 99, 1616, 2525, 3636, 4949, 6464, 8181, 100100, 121121, 144144, 169169, 196196, 225225, 256256, 289289, 324324, 361361, 400400, 441441, 484484, 529529, 576576, 625625, 676676, 729729, 784784, 841841, 900900, 961961, 10241024, 10891089, 11561156 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Aaron Toponce, Table of n, a(n) for n = 1..10000 FORMULA a(n) = A020338(n^2) = n^2 * (1 + 10^(A004216(n^2)+1)). MAPLE seq(n^2*(1+10^(1+ilog10(n^2))), n=1..100); # Robert Israel, Jan 02 2015 MATHEMATICA Table[FromDigits[Join[IntegerDigits[n^2], IntegerDigits[n^2]]], {n, 40}] PROG (MAGMA) [Seqint(Intseq(n^2) cat Intseq(n^2)): n in [1..40]]; (PARI) vector(100, n, eval(concat(Str(n^2), Str(n^2)))) \\ Derek Orr, Jan 02 2015 CROSSREFS Cf. A000290, A020338, A175605. Sequence in context: A070930 A033584 A248126 * A172526 A111080 A299288 Adjacent sequences:  A253442 A253443 A253444 * A253446 A253447 A253448 KEYWORD nonn,base,easy AUTHOR Vincenzo Librandi, Jan 02 2015 STATUS approved

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Last modified March 23 14:17 EDT 2019. Contains 321431 sequences. (Running on oeis4.)