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A027718
Numbers k such that k^2+k+5 is a palindrome.
4
0, 1, 2, 8, 12, 26, 74, 127, 224, 230, 2751, 3462, 4012, 4067, 12752, 22424, 27548, 28168, 105322, 107422, 2358150, 2724718, 2775383, 4063892, 7569245, 85125933, 87579753, 106617617, 2237334999, 2426472519, 2765569146, 2781875716, 2815069131, 4029203527
OFFSET
1,3
LINKS
MATHEMATICA
palQ[n_] := Block[{d = IntegerDigits[n]}, d == Reverse[d]]; f[n_] := n^2 + n + 5; Select[Range[0, 10^5], palQ@ f@ # &] (* Giovanni Resta, Aug 29 2018 *)
CROSSREFS
KEYWORD
nonn,base
EXTENSIONS
More terms from Giovanni Resta, Aug 28 2018
STATUS
approved