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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
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.
CROSSREFS
Sequence in context: A221242 A075411 A114763 * A053953 A024058 A357536
KEYWORD
base,nonn,hard
AUTHOR
Amarnath Murthy, Mar 30 2002
EXTENSIONS
More terms from David Wasserman, Apr 17 2003
STATUS
approved