Numbers with prime factorization p^2*q^4*r^4 where p, q, and r are distinct primes.

Terms

a(0) =32400a(1) =63504a(2) =90000a(3) =156816a(4) =202500a(5) =219024a(6) =345744a(7) =374544a(8) =467856a(9) =490000a(10) =685584a(11) =777924a(12) =960400a(13) =1089936a(14) =1210000a(15) =1245456a(16) =1690000a(17) =1774224a(18) =2108304a(19) =2178576a(20) =2396304a(21) =2480625a(22) =2862864a(23) =2890000a(24) =3610000a(25) =3640464a(26) =4112784a(27) =4511376