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A069501 a(1) = 9; a(n) = smallest multiple of a(n-1) which is a palindromic square. 1
9, 12321, 102030201, 12345654321, 102234363432201, 10022014302620341022001, 10002000320024001610042002300020001 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

LINKS

Table of n, a(n) for n=0..6.

P. De Geest, Palindromic squares

CROSSREFS

Cf. A069502.

Sequence in context: A321618 A055320 A271717 * A030254 A206461 A258719

Adjacent sequences:  A069498 A069499 A069500 * A069502 A069503 A069504

KEYWORD

nonn,base,hard

AUTHOR

Amarnath Murthy, Mar 30 2002

EXTENSIONS

More terms from Sascha Kurz, Feb 07 2003

STATUS

approved

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Last modified February 29 05:25 EST 2020. Contains 332353 sequences. (Running on oeis4.)