Numbers k with record values of the ratio d(k)/ud(k) between the number of divisors and the number of unitary divisors.

A307870

Numbers k with record values of the ratio d(k)/ud(k) between the number of divisors and the number of unitary divisors.

Terms

    a(0) =1a(1) =4a(2) =8a(3) =16a(4) =32a(5) =64a(6) =128a(7) =256a(8) =432a(9) =576a(10) =864a(11) =1296a(12) =1728a(13) =2592a(14) =3456a(15) =5184a(16) =6912a(17) =10368a(18) =15552a(19) =20736a(20) =31104a(21) =41472a(22) =62208a(23) =82944a(24) =93312a(25) =124416a(26) =186624a(27) =248832a(28) =373248a(29) =497664

External references