a(n) = smallest square which is the product of a minimal set of distinct numbers not less than n.

Terms

a(0) =1a(1) =36a(2) =144a(3) =4a(4) =400a(5) =576a(6) =784a(7) =14400a(8) =9a(9) =32400a(10) =4356a(11) =3600a(12) =6084a(13) =1587600a(14) =129600a(15) =16a(16) =10404a(17) =11664a(18) =23104a(19) =14400a(20) =15876a(21) =17424a(22) =33856a(23) =20736a(24) =25a(25) =876096a(26) =25401600a(27) =1254400a(28) =53824a(29) =44100