Numbers k such that pi(k) = rad(k), where pi = A000720, rad = A007947.

A378928

Numbers k such that pi(k) = rad(k), where pi = A000720, rad = A007947.

Terms

    a(0) =4a(1) =120a(2) =350a(3) =1116a(4) =64700a(5) =1304511a(6) =3523884a(7) =9559575a(8) =189961956a(9) =189964332a(10) =514275185a(11) =514275546a(12) =1394194200a(13) =3779851131a(14) =75370121712a(15) =204475052375a(16) =204475052625a(17) =204475053625a(18) =204475054125a(19) =204475054750

External references