Powerful numbers, definition (1): if a prime p divides n then p^2 must also divide n (also called squareful, square full, square-full or 2-powerful numbers).

A001694

Powerful numbers, definition (1): if a prime p divides n then p^2 must also divide n (also called squareful, square full, square-full or 2-powerful numbers).

Terms

    a(0) =1a(1) =4a(2) =8a(3) =9a(4) =16a(5) =25a(6) =27a(7) =32a(8) =36a(9) =49a(10) =64a(11) =72a(12) =81a(13) =100a(14) =108a(15) =121a(16) =125a(17) =128a(18) =144a(19) =169a(20) =196a(21) =200a(22) =216a(23) =225a(24) =243a(25) =256a(26) =288a(27) =289a(28) =324a(29) =343

External references