30*a(n) - 1 is the least prime of the form 2^r*3^s*5^t - 1, r > 0, s > 0, t > 0, r + s + t = n.

Terms

a(0) =1a(1) =2a(2) =6a(3) =8a(4) =16a(5) =48a(6) =96a(7) =432a(8) =384a(9) =512a(10) =2304a(11) =4608a(12) =23040a(13) =8192a(14) =24576a(15) =49152a(16) =65536a(17) =294912a(18) =655360a(19) =1310720a(20) =2621440a(21) =10616832a(22) =6291456a(23) =28311552a(24) =62914560a(25) =75497472a(26) =251658240a(27) =838860800a(28) =402653184a(29) =805306368