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A069500 a(1) = 1; a(n) = smallest multiple of a(n-1) which is a palindromic square. 0
1, 4, 484, 69696 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

a(5) is greater than 10^23. A naive probabilistic argument suggests that each time the search limit is increased by two orders of magnitude, the chance of finding a(5) is about 1%. The probabilistic argument also suggests that this sequence grows about as fast as the polypowers with base exp(1/2). - David Wasserman, Apr 17 2003.

LINKS

Table of n, a(n) for n=1..4.

CROSSREFS

Sequence in context: A221242 A075411 A114763 * A053953 A024058 A330579

Adjacent sequences:  A069497 A069498 A069499 * A069501 A069502 A069503

KEYWORD

base,nonn,hard

AUTHOR

Amarnath Murthy, Mar 30 2002

EXTENSIONS

More terms from David Wasserman, Apr 17 2003

STATUS

approved

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Last modified February 26 20:23 EST 2020. Contains 332295 sequences. (Running on oeis4.)