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

Terms

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