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) =40a(5) =72a(6) =160a(7) =288a(8) =256a(9) =512a(10) =2560a(11) =2048a(12) =6144a(13) =30720a(14) =24576a(15) =122880a(16) =147456a(17) =737280a(18) =1638400a(19) =1179648a(20) =3932160a(21) =4718592a(22) =21233664a(23) =12582912a(24) =25165824a(25) =382205952a(26) =67108864a(27) =679477248a(28) =1509949440a(29) =805306368