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A084991
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Palindromes which can be written as a sum of two prime numbers.
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0
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4, 5, 6, 7, 8, 9, 22, 33, 44, 55, 66, 88, 99, 111, 141, 151, 181, 202, 212, 222, 232, 242, 252, 262, 272, 282, 292, 313, 333, 404, 414, 424, 434, 444, 454, 464, 474, 484, 494, 505, 525, 565, 595, 606, 616, 626, 636, 646, 656, 666, 676, 686, 696, 808, 818, 828, 838, 848, 858, 868, 878, 888, 898, 909, 939, 949, 969, 979, 999
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listen;
history;
text;
internal format)
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OFFSET
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1,1
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LINKS
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EXAMPLE
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E.g. 181 is a palindrome and is 179 + 2. 179 and 2 are both prime.
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MATHEMATICA
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With[{upto=1000}, Select[Select[Union[Total/@Tuples[Prime[ Range[ upto]], 2]], # == IntegerReverse[#]&], #<=upto&]] (* Harvey P. Dale, Nov 24 2017 *)
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CROSSREFS
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KEYWORD
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nonn,base
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AUTHOR
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Meenakshi Srikanth (menakan_s(AT)yahoo.com), Jun 27 2003
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EXTENSIONS
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STATUS
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approved
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