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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
OFFSET
1,1
LINKS
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
KEYWORD
nonn,base,easy
AUTHOR
Vincenzo Librandi, Jan 02 2015
STATUS
approved