a(1)=7; if n = Product p_i^e_i, n > 1, then a(n) = Product p_{i+4}^e_i.

Terms

a(0) =7a(1) =11a(2) =13a(3) =121a(4) =17a(5) =143a(6) =19a(7) =1331a(8) =169a(9) =187a(10) =23a(11) =1573a(12) =29a(13) =209a(14) =221a(15) =14641a(16) =31a(17) =1859a(18) =37a(19) =2057a(20) =247a(21) =253a(22) =41a(23) =17303a(24) =289a(25) =319a(26) =2197a(27) =2299a(28) =43a(29) =2431