Numbers with 21 divisors.

Terms

a(0) =576a(1) =1600a(2) =2916a(3) =3136a(4) =7744a(5) =10816a(6) =18225a(7) =18496a(8) =23104a(9) =33856a(10) =35721a(11) =53824a(12) =61504a(13) =62500a(14) =87616a(15) =88209a(16) =107584a(17) =118336a(18) =123201a(19) =140625a(20) =141376a(21) =179776a(22) =210681a(23) =222784a(24) =238144a(25) =263169a(26) =287296a(27) =322624a(28) =341056a(29) =385641