Numbers of the form k^2 - k - 1 whose digit sum is also a number of the form k^2 - k - 1.

Terms

a(0) =1a(1) =5a(2) =29a(3) =41a(4) =131a(5) =155a(6) =209a(7) =379a(8) =461a(9) =551a(10) =649a(11) =991a(12) =1055a(13) =1121a(14) =1189a(15) =1639a(16) =1721a(17) =1891a(18) =2351a(19) =2449a(20) =2755a(21) =3079a(22) =3305a(23) =3781a(24) =4159a(25) =4421a(26) =4555a(27) =5699a(28) =5851a(29) =6005