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A071278
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Sorted list of numbers b(i)*b(i), 2 < i < j, where b = A002113 = 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 11, 22, 33 ... is a list of the decimal palindromes.
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0
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6, 8, 10, 12, 12, 14, 15, 16, 18, 18, 20, 21, 22, 24, 24, 27, 28, 30, 32, 33, 35, 36, 40, 42, 44, 44, 45, 48, 54, 55, 56, 63, 66, 66, 66, 72, 77, 88, 88, 88, 99, 99, 110, 110, 132, 132, 132, 132, 154, 154, 165, 165, 176, 176, 176, 198, 198, 198, 198, 202, 220, 220, 222
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OFFSET
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1,1
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COMMENTS
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Old name was: Palindromes which are nontrivial multiples of 2 distinct palindromes.
Repetitions are allowed. 12 appears twice because it is both 2*6 and 3*4.
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LINKS
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EXAMPLE
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8 is in the sequence because 8=2*4.
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MATHEMATICA
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Module[{nn=250, pals}, pals=Select[Range[2, nn], PalindromeQ]; Select[Sort[ Times@@#&/@ Subsets[pals, {2}]], #<=nn&]] (* Requires Mathematica version 10 or later *) (* Harvey P. Dale, May 27 2018 *)
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CROSSREFS
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KEYWORD
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base,nonn
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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