A088780 a(1) = 9, a(n) = smallest palindromic multiple of a(n-1) obtained by inserting digits anywhere in a(n-1).

9, 99, 9009, 909909, 9009009009, 90099099099009, 90009090099009090009, 9000009009009009009009000009, 90000090099090099099099009099009000009

Offset

1,1

Links

Table of n, a(n) for n=1..9.

Crossrefs

Cf. A082776, A082777, A082778, A082779, A082781, A082782, A082783.

Sequence in context: A078238 A080494 A077710 * A132544 A367353 A017018

Adjacent sequences: A088777 A088778 A088779 * A088781 A088782 A088783

Keyword

nonn,base,more,changed

Author

Ray Chandler, Oct 26 2003

Extensions

a(8) from David Consiglio, Jr., Sep 30 2022

a(9) from Max Alekseyev, Nov 24 2024

Status

approved