A027714 Numbers k such that k^2+k+3 is a palindrome.
0, 1, 2, 5, 19, 23, 60, 71, 175, 179, 184, 243, 753, 2431, 6154, 23111, 30947, 73188, 75146, 230663, 237721, 598350, 3093852, 5492899, 17605724, 18886025, 30909092, 62127180, 76675186, 177865385, 230098566, 309230287, 549199524, 589167859, 726714741
Offset: 1
Links
- Giovanni Resta, Table of n, a(n) for n = 1..50
- P. De Geest, Palindromic Quasi_Over_Squares of the form n^2+(n+X)
Programs
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Mathematica
npalQ[n_]:=Module[{c=n^2+n+3},c==IntegerReverse[c]]; Select[Range[ 0,31*10^5],npalQ] (* Requires Mathematica version 10 or later *) (* Harvey P. Dale, Aug 15 2016 *)
Extensions
More terms from Giovanni Resta, Aug 29 2018