A166498 Integers formed by concatenating squares.

0, 1, 4, 9, 10, 11, 14, 16, 19, 25, 36, 40, 41, 44, 49, 64, 81, 90, 91, 94, 99, 100, 101, 104, 109, 110, 111, 114, 116, 119, 121, 125, 136, 140, 141, 144, 149, 160, 161, 164, 169, 181, 190, 191, 194, 196, 199, 225, 250, 251, 254, 256, 259, 289, 324, 360, 361

Offset

1,3

Links

Table of n, a(n) for n=1..57.

Example

11 being the concatenation of 1 and 1, both squares, is in the sequence.
120 is not in the sequence as none of 2, 12, 20 and 120 are squares. - corrected by Peter Munn, Nov 17 2017

Crossrefs

Cf. A000290 (squares), A152242 (integers formed by concatenating primes).

Sequence in context: A173297 A161913 A020673 * A266297 A174800 A062371

Adjacent sequences: A166495 A166496 A166497 * A166499 A166500 A166501

Keyword

base,nonn

Author

Zak Seidov, Oct 15 2009

Extensions

Corrected and extended by Michel Marcus, Oct 16 2013

Mispositioning of example corrected by Peter Munn, Nov 17 2017

Status

approved