Palindromes of form k^2 + k + 7.

Terms

a(0) =7a(1) =9a(2) =313a(3) =999a(4) =31513a(5) =75357a(6) =78687a(7) =90909a(8) =98289a(9) =3159513a(10) =7642467a(11) =9009009a(12) =743080347a(13) =900090009a(14) =31413131413a(15) =90000900009a(16) =97474147479