Numbers k such that k^2 + 1 is a palindrome.

Terms

a(0) =0a(1) =1a(2) =2a(3) =10a(4) =25a(5) =100a(6) =1000a(7) =1020a(8) =1489a(9) =2248a(10) =10000a(11) =10090a(12) =100000a(13) =100910a(14) =102020a(15) =167491a(16) =1000000a(17) =1000200a(18) =1009090a(19) =2744934a(20) =10000000a(21) =10000900a(22) =10090910a(23) =24917195a(24) =100000000a(25) =100909090a(26) =103226660a(27) =271867456a(28) =1000000000a(29) =1000002000