Numbers m of the form 2^i * 3^j * 5^k such that i, j, k > 0 and m+1 and m-1 are both prime numbers.

Terms

a(0) =30a(1) =60a(2) =150a(3) =180a(4) =240a(5) =270a(6) =600a(7) =810a(8) =1620a(9) =3000a(10) =4050a(11) =4800a(12) =9000a(13) =9720a(14) =15360a(15) =21600a(16) =23040a(17) =33750a(18) =138240a(19) =180000a(20) =281250a(21) =345600a(22) =737280a(23) =3456000a(24) =6144000a(25) =6561000a(26) =10125000a(27) =13668750a(28) =15552000a(29) =17496000