login
A033934
a(n) = (10^n+1)^2.
13
4, 121, 10201, 1002001, 100020001, 10000200001, 1000002000001, 100000020000001, 10000000200000001, 1000000002000000001, 100000000020000000001, 10000000000200000000001, 1000000000002000000000001, 100000000000020000000000001, 10000000000000200000000000001
OFFSET
0,1
COMMENTS
The members of this sequence are both perfect squares and palindromes. Therefore A002779 is an infinite sequence. [Ant King, Jun 26 2011]
FORMULA
a(n) = A062397(n)^2 = A066138(n) + A011557(n).
MATHEMATICA
(10^Range[0, 20]+1)^2 (* or *) LinearRecurrence[{111, -1110, 1000}, {4, 121, 10201}, 20] (* Harvey P. Dale, Feb 16 2016 *)
CROSSREFS
Cf. A002779 (palindromic squares), A000290 (squares), A002113 (palindromes).
Sequence in context: A241366 A358570 A263612 * A362848 A144508 A169972
KEYWORD
nonn,base,easy
AUTHOR
EXTENSIONS
Better description from Henry Bottomley, Dec 07 2001
More terms from Harvey P. Dale, Feb 16 2016
STATUS
approved