A066673 Smallest term x from A066669 such that phi(x) = 2^n times some prime.

7, 13, 35, 65, 97, 193, 485, 769, 1649, 3281, 8245, 12289, 24929, 49601, 124645, 197633, 423793, 786433, 2118965, 3158273, 6357089, 12648641, 31785445, 50397953, 108070513, 202113281, 540352565, 805384193, 1633771873, 3221225473, 8168859365, 12952273921

Offset: 1

Author

Labos Elemer, Dec 18 2001

Keywords

• nonn

Examples

			Phi of {7, 13, 35, 65, 97, 193, 485, 769} is {6, 12, 24, 48, 96, 192, 384, 768}, of which {2, 4, 8, 16, 32, 64, 128, 256} are the largest even factors.
		

Crossrefs

Cf. A000010, A066669-A066672.

Extensions

a(9)-a(30) from Donovan Johnson, May 23 2011

a(31)-a(32) from Donovan Johnson, May 26 2013