Squarefree nonprimes n with a divisor d such that phi(n) divides n+d.

Terms

a(0) =1a(1) =2a(2) =3a(3) =6a(4) =10a(5) =15a(6) =21a(7) =30a(8) =42a(9) =70a(10) =110a(11) =210a(12) =255a(13) =285a(14) =465a(15) =510a(16) =570a(17) =930a(18) =1430a(19) =2530a(20) =2590a(21) =2870a(22) =3010a(23) =4970a(24) =6699a(25) =13398a(26) =27645a(27) =28785a(28) =54435a(29) =55290