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A027717
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Palindromes of form k^2 + k + 4.
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4
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4, 6, 424, 40204, 48184, 68386, 4002004, 4992994, 6510156, 6830386, 400020004, 424545424, 40000200004, 41162526114, 42314341324, 47678687674, 4000002000004, 4644626264464, 6201427241026, 6866949496686, 400000020000004, 669896222698966, 40000000200000004
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internal format)
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OFFSET
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1,1
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LINKS
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MATHEMATICA
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Select[Table[n^2+n+4, {n, 0, 25*10^5}], IntegerDigits[#] == Reverse[ IntegerDigits[ #]]&] (* Harvey P. Dale, Mar 05 2015 *)
Select[Table[n^2+n+4, {n, 0, 25*10^5}], PalindromeQ] (* Harvey P. Dale, Dec 23 2023 *)
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CROSSREFS
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KEYWORD
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nonn,base,changed
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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