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

Terms

a(0) =44100a(1) =108900a(2) =152100a(3) =213444a(4) =260100a(5) =298116a(6) =324900a(7) =476100a(8) =509796a(9) =592900a(10) =636804a(11) =736164a(12) =756900a(13) =828100a(14) =864900a(15) =933156a(16) =1232100a(17) =1258884a(18) =1334025a(19) =1416100a(20) =1483524a(21) =1512900a(22) =1572516a(23) =1664100a(24) =1695204a(25) =1758276a(26) =1768900a(27) =1863225