The product of n's prime powers, with the base and exponent concatenated.

Terms

a(0) =1a(1) =21a(2) =31a(3) =22a(4) =51a(5) =651a(6) =71a(7) =23a(8) =32a(9) =1071a(10) =111a(11) =682a(12) =131a(13) =1491a(14) =1581a(15) =24a(16) =171a(17) =672a(18) =191a(19) =1122a(20) =2201a(21) =2331a(22) =231a(23) =713a(24) =52a(25) =2751a(26) =33a(27) =1562a(28) =291a(29) =33201