Least k such that n divides d(sigma(k)) (d = A000005).

Terms

a(0) =1a(1) =2a(2) =3a(3) =5a(4) =33a(5) =6a(6) =105a(7) =14a(8) =22a(9) =33a(10) =651a(11) =24a(12) =2667a(13) =105a(14) =66a(15) =54a(16) =57337a(17) =88a(18) =172011a(19) =114a(20) =210a(21) =1302a(22) =2752491a(23) =120a(24) =510a(25) =5334a(26) =472a(27) =378a(28) =199753347a(29) =264