n such that the Moebius function take successively, from n, the values -1,0,-1,0,-1,0.

Terms

a(0) =195a(1) =1491a(2) =1547a(3) =1947a(4) =2139a(5) =2715a(6) =2749a(7) =2751a(8) =2847a(9) =2967a(10) =3359a(11) =3615a(12) =3819a(13) =4011a(14) =4013a(15) =4015a(16) =4047a(17) =4155a(18) =4547a(19) =5019a(20) =5449a(21) =5647a(22) =5741a(23) =5779a(24) =6351a(25) =6353a(26) =6355a(27) =6447a(28) =6547a(29) =6563