Sphenic numbers k such that none of k-2, k-1, k+1 and k+2 is squarefree.

Terms

a(0) =170a(1) =530a(2) =638a(3) =874a(4) =962a(5) =1826a(6) =2526a(7) =2674a(8) =2726a(9) =2782a(10) =2874a(11) =3178a(12) =3970a(13) =4490a(14) =4526a(15) =4654a(16) =5930a(17) =6026a(18) =6254a(19) =7138a(20) =7174a(21) =8074a(22) =8126a(23) =8426a(24) =8723a(25) =8958a(26) =8974a(27) =9926a(28) =10286a(29) =10526