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

1,3

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)

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 *)

Crossrefs

Cf. A027713, A014206, A028413, A027714.

Sequence in context: A346407 A369390 A324376 * A282139 A138307 A323101

Adjacent sequences: A027709 A027710 A027711 * A027713 A027714 A027715

Keyword

nonn,base

Author

Patrick De Geest

Extensions

More terms from Giovanni Resta, Aug 28 2018

Status

approved