a(n) is the smallest integer k such that phi(k) + n | sigma(k + n).

Terms

a(0) =1a(1) =2a(2) =4a(3) =7a(4) =6a(5) =1a(6) =9a(7) =3a(8) =2a(9) =65a(10) =4a(11) =50a(12) =15a(13) =156a(14) =8a(15) =60a(16) =6a(17) =80a(18) =6a(19) =15a(20) =10a(21) =126a(22) =16a(23) =49a(24) =14a(25) =33a(26) =12a(27) =1a(28) =26a(29) =60