Smallest number with a prime signature whose indices are the decimal digits of n.

Terms

a(0) =1a(1) =2a(2) =4a(3) =8a(4) =16a(5) =32a(6) =64a(7) =128a(8) =256a(9) =512a(10) =2a(11) =6a(12) =12a(13) =24a(14) =48a(15) =96a(16) =192a(17) =384a(18) =768a(19) =1536a(20) =4a(21) =12a(22) =36a(23) =72a(24) =144a(25) =288a(26) =576a(27) =1152a(28) =2304a(29) =4608