A068864 a(1) = 1; a(n+1) is the smallest square not already in the sequence which differs from a(n) at every digit.

1, 4, 9, 16, 25, 36, 49, 64, 81, 100, 225, 144, 256, 121, 289, 196, 324, 169, 400, 361, 484, 529, 441, 576, 625, 784, 676, 729, 841, 900, 1024, 961, 1089, 2116, 1225, 2304, 1156, 2025, 1296, 2401, 1369, 2500, 1444, 2209, 1521, 2704, 1681, 2809, 1764, 2601

Offset

1,2

Comments

Has a distinctive but unusual graph. - N. J. A. Sloane, Mar 19 2024

Links

David A. Corneth, Table of n, a(n) for n = 1..10356

David A. Corneth, PARI program

Example

144 follows 225 as the smallest square not included earlier and differing at every digit position with 225.

Prog

(PARI) \\ See PARI link

Crossrefs

Cf. A000290, A068854.

Sequence in context: A077487 A179334 A068867 * A068854 A111704 A052041

Adjacent sequences: A068861 A068862 A068863 * A068865 A068866 A068867

Keyword

nonn,base,look

Author

Amarnath Murthy, Mar 13 2002

Extensions

Edited by Larry Reeves (larryr(AT)acm.org), Oct 09 2003

Status

approved