A027712 Numbers k such that k^2+k+2 is a palindrome.
0, 1, 2, 4, 6, 14, 15, 21, 50, 92, 201, 203, 292, 479, 897, 1424, 1530, 1654, 2001, 2106, 2183, 16780, 20001, 20993, 28377, 89777, 200001, 219083, 501474, 1620660, 1651754, 2000001, 14842995, 17101809, 20000001, 21147906, 21855108, 22012038, 29287052
Offset: 1
Links
- Giovanni Resta, Table of n, a(n) for n = 1..65
- P. De Geest, Palindromic Quasi_Over_Squares of the form n^2+(n+X)
Programs
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Mathematica
palQ[n_] := Block[{d = IntegerDigits[n]}, d == Reverse[d]]; f[n_] := n^2 + n + 2; Select[Range[0, 10^5], palQ@ f@ # &] (* Giovanni Resta, Aug 29 2018 *)
Extensions
More terms from Giovanni Resta, Aug 28 2018