[seqfan] Number times reversal

franktaw at netscape.net franktaw at netscape.net
Sat Jan 7 10:00:13 CET 2012


https://oeis.org/A061205 is the sequence of integers multiplied by 
their digit reversals; e.g. a(12) = 12*21 = 252.

The sequence includes the squares of palindromes times powers of 10, 
each occurring once; and products of non-palindromes and their 
reversals, each occurring twice.

What I'm wondering is whether there are any other duplications in the 
sequence; equivalently, any number that occurs more than twice in the 
sequence.

Franklin T. Adams-Watters



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