Numbers k that divide Sum_{i=1..k} phi(i)^2, where phi(i) = totient function A000010.

Terms

a(0) =1a(1) =2a(2) =3a(3) =6a(4) =26a(5) =190a(6) =610a(7) =2078a(8) =2670a(9) =7038a(10) =16466a(11) =89973a(12) =150374a(13) =157298a(14) =163367a(15) =419090a(16) =640627a(17) =879702a(18) =3479689a(19) =5618437a(20) =11304721a(21) =74106171a(22) =471591726a(23) =475915439a(24) =1198344149a(25) =2270643086a(26) =3051266010