Palindromes of form k^2 + k + 1.

Terms

a(0) =1a(1) =3a(2) =7a(3) =111a(4) =343a(5) =757a(6) =10101a(7) =15751a(8) =30103a(9) =1001001a(10) =1255521a(11) =1403041a(12) =1837381a(13) =3372733a(14) =3521253a(15) =3847483a(16) =100010001a(17) =141979141a(18) =10000100001a(19) =14181118141a(20) =16112621161a(21) =35297579253a(22) =35475157453a(23) =37011411073a(24) =38735553783