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

1,1

Links

Table of n, a(n) for n=1..32.

Example

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.

Sequence in context: A001001 A067692 A117706 * A307762 A290947 A267985

Adjacent sequences: A066670 A066671 A066672 * A066674 A066675 A066676

Keyword

nonn

Author

Labos Elemer, Dec 18 2001

Extensions

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

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

Status

approved