A253445 a(n) = concatenation of n^2 with itself.

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

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