Palindromes of form k^2 + k + 5.

Terms

a(0) =5a(1) =7a(2) =11a(3) =77a(4) =161a(5) =707a(6) =5555a(7) =16261a(8) =50405a(9) =53135a(10) =7570757a(11) =11988911a(12) =16100161a(13) =16544561a(14) =162626261a(15) =502858205a(16) =758919857a(17) =793464397a(18) =11092829011a(19) =11539593511