Indices of 4's in A090822.

Terms

a(0) =220a(1) =440a(2) =661a(3) =881a(4) =1105a(5) =1325a(6) =1546a(7) =1766a(8) =1991a(9) =2211a(10) =2432a(11) =2652a(12) =2876a(13) =3096a(14) =3317a(15) =3537a(16) =3771a(17) =3991a(18) =4212a(19) =4432a(20) =4656a(21) =4876a(22) =5097a(23) =5317a(24) =5542a(25) =5762a(26) =5983a(27) =6203a(28) =6427a(29) =6647